Mayu Miyano is the childhood friend of Takashi who lives directly across the street from their house. She is depicted as a busty meganekko who is ditsy, clumsy, and has a timid personality. Mayu secretly has feelings for Takashi but doesn't have the courage to confess to him. Because of this and her close history with Takashi, she is perceived by Yamada as a rival for his virginity. One of her favorite hobbies is cooking. Her first love was actually Takashi's sister Kazuki, who she thought was a boy. Miyano's erogami is dressed as a fairy princess and gives innocent advice such as kissing the cookies she gives to Takashi is like giving him an indirect kiss.
Miharu Takeshita is the best friend and classmate of Yamada. Despite her friend's prurient interests, Miharu tries her best to be of help even going so far as to invite Takashi on a double date at the water park. At times she is the subject of Yamada's envy due to her bustiness of which earned her the moniker "F-shita" as a reference to her cup size. She also has a boyfriend whom she rarely talks about because of Yamada and her lewdness.
A girl who is the last remaining member of the crew of the fallen ship "Planet #8". Tongpoo first encounters her while she was bathing in a lake while stranded on an alien planet. She becomes Tongpoo's ditsy sidekick.
Voiced by: Fukuyama Jun (Drama CD) Grade: Third Year Birthday: October 30 Sign: Scorpio Height: 171cm Blood Type: AB Favorite: Light, soft and fluffy things Hate: A lightweight Third year at St. Nazareth Academy, who lives in S-hall. He is very small and cute for his age. And also has a close bond with Kitou. He usually hits Kitou when he talks about girls or hits on one.
Voiced by: Nakamura Yuuichi (Drama CD) Age: 16 Birthday: December 7th Sign: Sagittarius Height: 183cm Blood Type: O Hates: Old fashioned things Cain is a first year at St. Nazareth Academy. He is the President of the student council, he beat out Kitou for it. Cain lives in the famous A-hall. He is very cold and mean. But doesn't show this to his fans, to them he is a sweet guy. Hiyoki thought he had dual personality. He takes afternoon naps and likes to tease Hiyoki about her hair calling her tails. Cain has a very big hate for S-hall. The reason as to why is unknown yet. Cain has a very mysterious air around him. His big plan is to dimolish S-hall. He possesses the same ability as Hiyoki, a "Dream-seer" but has less power than her. He was a former resident at S-Hall who was originally paired up with Hiyoki to be roommates with her, even though she had not transferred yet. Towards the end of the story he tries to steal her heart but stops himself in the process. He develops romantic feelings towards her (throughout the story) and in the end confesses to her. Of course, Hiyoki indirectly accepts.