To LOVE Ru Darkness 2

Rito begins his day with the usual activities: Momo sneaking into his bed, a beating from Nana, and accidental groping with Lala. On the way to school, Rito greets all of his classmates and receives another beating from Yami for running into her. As they prepare for class, Momo reminds Rito of her harem plan. Lala also encourages Haruna to confess to Rito. In the afternoon, Haruna, fresh from tennis practice, finds Nana at school for her remedial classes. They sit together and have a chat; Nana also shares a Deviluke sports drink with Haruna. Momo, waiting for Rito to finish his remedial classes, joins them. She asks Haruna about her progress with Rito in which Haruna admits she needs help. She loves Rito but does not want to jeopardize her friendship with Lala as she loves Rito too. By Earth's tradition, Rito can only marry one woman. Momo tries to convince Haruna that polygamy is common in the universe and that Earth is simply outdated. As Nana argues with Momo about polygamy, Haruna suddenly begins to act strange. Rito arrives and informs Momo and Nana that the Deviluke drink earlier has made Haruna drunk. Momo, attempting to advance her harem plan, requests Rito to escort Haruna home. Rito accepts and avoids detection from the principal. At Haruna's apartment, Haruna, still drunk, seduces Rito and mentions Momo's harem plan. Rito asks Haruna about her feelings for the harem plan but Haruna sobers up. Akiho also arrives home and greets Haruna in an embarrassing situation. Rito quickly leaves. While Akiho continuously apologizes to Haruna, Momo finds Rito and asks him about his day with Haruna. Meanwhile, Mea is asking for Nemesis's whereabouts.

Rito finds Momo in his bed again. Momo reminds Rito about her harem plan and advises him to be careful of Mea. Meanwhile, Mea is worried that Nemesis is not responding to her as she always relies on her master for directions. She tries to hide her concerns from Nana who is inviting her to a bakery. Elsewhere, Tearju thanks Rito for helping her and asks him if Momo has new information about Mea. Momo is more concerned about Yami skipping classes. Tearju understands Yami's motives about staying away from her and wishes to see her and Mikan, Yami's friend. As Rito thinks about the friendship, Lala bumps into him and accidentally drops an invention. Rito activates it turning him into a mouse. Being small, Rito can easily see girl's underwear, making him uncomfortable. He desperately searches for Lala but his small size makes him vulnerable to being stepped on. He eventually lands under Yami's clothing. Rito manages to escape with her underwear but passes out. Mea finds Rito and remembers Nemesis's words about weak people being weeded out. She helps Rito anyways and Rito recovers in time for a beating from Yami. As Yami leaves, Mea asks Yami about feelings and how Nemesis never taught her this subject. Yami tells Mea to discover it herself. Afterschool, Rito finds Mea on the roof in her battle clothes and asks about her motives. He tries to convince Mea not to rely solely on her master Nemesis but it enrages her. Mea seduces Rito with her Psycho Dive ability but alien enemies also approach and attack Mea, leading Rito and Mea on a wild rampage. During the fight, Mea realizes that Nemesis is reminding her that she is a weapon. Nana also spots Mea in her weapon form.

Nana is heartbroken as she remembers Mea's true form as a weapon. Mea notes that she was following her master's orders to disguise as a human. She also requests a breakup of their friendship because weapons and humans can never be together. Later at night, Momo informs Rito that Nana has shut herself in her room. Momo also blames herself for not intervening given that she was already suspicious of Mea. Rito assures Momo by talking to Nana himself. He finds Nana inside a virtual space filled with her animal friends. Nana tells Rito how she wanted to help Mea as Mea was always alone. Despite her efforts, Nana feels that Mea never saw her as a friend and was only playing with her. Rito hugs Nana and assures that she can still make up. The Psycho Dive ability showed Rito Mea's fears and loneliness of being a weapon. Feeling confident, Nana seeks Mea. As for Mea, she is sitting near a river trying to justify her actions. She reminds herself that she is a weapon and only befriended Nana to bring Yami out. Nana finds Mea and confronts her. Mea, fixated on her identity, keeps Nana away by attacking her. Momo tries to intervene but Rito stops her. Nana dodges Mea's attacks until Mea activates her Psycho Dive. With the ability, Mea finds out that Nana consulted with Rito. Mea tries to explain to Nana in detail why they cannot be together but Nana refutes, stating that regardless of her identity, only the feelings matter. Mea is unsure about Nana's words but accepts her request to be friends again. Yami, who happened to be dealing with the alien assassins targeting Mea, arrives. Mea thanks Yami and admits she partially understands Yami's words on emotions and feelings. At night, Nana can't sleep and she remembers how warm Rito's hug was and decides to sneak into bed with him, but as usual, Momo was already there and Rito gets beat up by Nana.

The town of Sainan is bustling as a fireworks show approaches. Nana sets out with Mea, and Lala with Haruna and her friends, to the shrine to enjoy the festival, while Momo spends the time alone with Rito and feels her love for him surface again. Then Mikan, who should have been with Tearju, comes running to Rito in a panic...

Rito encounters Yui on a train, and feels extremely awkward after having run into "trouble" with her the previous night. The train grows more crowded and the two find themselves squeezed precariously close together... Later that night, Mea joins the Yuuki household for dinner at Mikan's invitation.

Rito and Momo end up alone together as they walk home from helping Rito's dad. Momo's mind fills with sweet fantasies, but then Nemesis appears and drags Rito away to play. Not only has Momo lost her alone time with him, but now Nemesis is trying to convince Rito that she can't be trusted! That night, someone walks in as Rito is bathing, and who he thinks is Momo turns out to be...

Thanks to Lala's massage tool, Honekawa feels better and resumes his teaching duties. Tearju is reassigned to teach the class that Momo, Nana, and Mea are enrolled in. As she begins class, she feels depressed as she sees the empty desk. During break, Momo confirms to Rito that Tearju is her new teacher. Momo wants to reunite Yami with her and tried to invite Yami back to class; Yami denied it. Rito chooses to talk to Yami himself. As he looks for Yami, Mea finds him. Mea is interested in his bathing experience with Nemesis and uses her Psycho Dive to recreate it. When Rito mentions Yami, Mea reads Rito's recent thoughts and backs away, feeling anger with Tearju. Rito tells Mea to reconcile with Tearju but Mea leaves. As for Yami, she invites Mikan to the library with her. At the library, Mikan is impressed with the breadth of Yami's reading and tells Yami about her past from Tearju. Mikan also invites Yami back to school but memories of Nemesis float into Yami's mind, making her feel uneasy. The next day, Rito finds Yami in the library and asks Yami to return back to school. He also mentions Tearju's thoughts of them being a family but Yami refuses to accept because of her identity as a weapon. Yami also tells Rito to stay away from her family business but is confronted by Mea, a member of her family. Mea relates Yami's thought to how she always followed orders from Nemesis. After the fight with Nana, Mea learns that she can follow her own path. Per Rito, she tells Yami to reconcile with Tearju. Although the meeting is interrupted by a dog interfering with the eavesdroppers Oshizu and Momo, Yami accepts Mea's words and shows up in Tearju's class the next day in her school uniform. She thanks Mea as she takes her seat.

Zastin tells a story about a cursed sword that turns its wielder into a killer seeking for blood. Next, Mikan receives a call from Rin inviting her over to Saki's place. All of Saki's servants are sick from her dinner and Rin needs people to fill in. Mikan has to cook for Saibai and Zastin and sends Rito instead, making Saki angry. Momo and her friends volunteer too. Rito quickly makes a negative impression by falling on top of Saki. During work, Mea talks about keeping her identity a secret while Momo observes Rito's interactions with Rin. Rito spots a shipment from Saki's father and offers to store it; Rin replies to leave it alone. Rito then comments about Rin's maid outfit leading to another incident; Rin sends Rito to the library. She later opens the shipment finding a red and purple sword. In the library, Momo asks Rito about Rin, but Rin breaks in with the red and purple sword asking for blood. Everyone notices Rin's chants and suspect that the sword is the cursed sword from Zastin's story. Yami notes that the sword is not cursed but a living weapon named "Bladix". Bladix uses its wielder to obtain his energy from blood. Yami, unable to free the sword, tries to destroy it but Mea stops her. Bladix is fused with Rin and if Yami destroyed it, Rin's mind would corrupt permanently. Rito then asks Mea to let him enter Rin's mind with Psycho-Dive despite the risks; Mea accepts. Inside Rin, Bladix tries to control Rito. He succeeds but Rito shares his feelings of protecting family members to Rin's mind, allowing Rin and him to escape. After Mea forcefully frees Bladix from Rin, he searches for a new mind only to be defeated by Yami. Zastin, having received an emergency call earlier about the sword, arrives too late to help.

Rin thanks Rito for saving her from Bladix despite Rito claiming that Yami was the one who saved her. Meanwhile, Lala is concerned with Haruna's progress with Rito. Peke understands Lala but is more worried about her fading relationship with Rito. Peke advises Lala to work on her relationship first. Lala proceeds and finds Rito being punished by Yami for groping Tearju. Lala asks Yami to forgive him in which she does, but Rito resumes his duty before Lala can speak to him. Momo also finds Nana lurking near Rito's classroom; Nana lies that she got lost and ended up here. As Nana leaves, Momo is happy but jealous that Rito notices Nana more than her. She then finds Lala consulting with Peke about Rito and joins in. Momo, knowing that Lala must be the wife for her harem plan to succeed, pushes Lala to advance her romance. On the way home, Momo observes Lala clinging onto Rito and finds it ineffective. She invites Lala to her room and teaches humanly love through her visual novel. Lala then teleports to Rito's bath and observes his manly body. Rito tries to escape, but Lala stops him and asks for a kiss as a sign of love. She tries to kiss Rito, but Rito slips and passes out underneath Lala. Later, Momo apologizes to Rito that she was behind all this. She showed Lala kissing and mentioned that it was the universal sign of love. Nana also finds Lala practicing kissing Rito on her doll and talks to her. The next day, Rito finds Lala and explains to her that he can't kiss her because their love has not advanced to that point. From her discussion with Nana, Lala accept Rito's feelings and kisses him on cheek, showing her feelings toward him. She hopes Rito can answer it some day. Momo, seeking help, decides to cooperate with Nana.