He is a student of Class 3-A of Fumizuki Academy. He is good friends with Yūsaku, forming the "Tokonatsu duo". He has appeared in the OVA of the series along with Yuusaku, where he ate the sesame dumpling Himeji made and was hit twice with German Suplex. Although they spread some false rumors about Class 2-F's business, Akihisa and Yuuji managed to set them up by framing Shunpei as a pervert for making "lewd" moves in public. In the tournament, he, alongside Yuusaku, managed to face Akihisa and Yuuji in the finals tournament (and still wearing the bra Akihisa had put him). He cheated by throwing an eraser on Akihisa's shokanjuu as a distraction, giving him an advantage. Although the duo got the upper hand, they were defeated by the combined efforts of Akihisa and Yuuji. His shokanjuu wears a kimono under a coat with 6 feathers and wields a giant pipe. He and Yuusaku later appear in the second season.
Teacher in charge of supervising student life. From Narrator he becomes the homeroom teacher for Class F after they lose to Class A. He possesses god-like abilities as proven when he rescues Minami, Yoshii and Himeji from falling. From an episode it looks like he can allow ESB battles no matter what subject it is (battle between B class and F class).
Age: 23 Akihisa's elder sister and an E cup. Contrary to her brother, she is good at learning and studied at Harvard University. She has a notable brother complex which greatly agitates Akihisa. She loves to kiss Akihisa.
Hideyoshi's sister and a member of class A. She beat Shimada in math in episode 2. Her summoned being wears knight armor and it uses a Lance as its main weapon. She seems to be interested in BL or Shounen Ai as revealed in episode 12.
Birthdate: November 11th, 1993 Zodiac sign: Scorpio Shouko Kirishima is the childhood friend of Yuuji Sakamoto. She is the top student in her level and the class representative for class A. In the story, she is portrayed as a soft-spoken, but highly assertive and intelligent girl. In the novel, her dialog always starts with ellipses. She is described as elegantly beautiful and very popular like a typical Yamato Nadeshiko, but yet has no boyfriend, which initially created the impression to others that she is a lesbian. Later, it was revealed that the reason for this is because she is crazily infatuated with Yuuji since childhood and acts possessively towards him, to the point of frequently poking out his eyes in order to prevent him from seeing other girls' underwear, applying locks and chains while they are together, using a hand-held taser if he is being 'unfaithful' to her, and even attempted to submit a marriage certificate to the civil registrar (but fails in the anime due to them being underage). Despite being tricked multiple times, she still shows a trusting nature towards Yuuji and practically believes everything he says. Shouko is also shown to be someone who is a very long-term thinker, and has already decided on her children's names (Shoyu for a girl, and Kosho for a boy). She is also "hopeless when it comes to gadgets" (機械音痴) and is known to ruin any electronic gadget that falls into her hands, although in the novels she brings one that contains Yuuji's supposed voice proposing to her and claims its 'normal music'. While she is a part of class A, Shouko often hangs around Akihisa's inner circle of class F only because she wants to be around Yuuji. Her Shoukanjuu is clad in Samurai armor and wields a Japanese longsword. During the ESB field error, her Shoukanjuu also becomes an adult version of herself wearing only an apron and lingerie.
Minami's younger sister. Grade 5. Calls Akihisa Idiotic Elder Brother. She has also expressed her wish to become Akihisa's bride in the future. (Source: Wikipedia)
Toshimitsu Kubo is a calm and cool man with glasses and the second ranked student in his level. He lives in a relatively tight and structured schedule which is reflected in his high grades. However, he easily misinterprets situations and because of this, he thinks that Akihisa was trying to hit on him. As a result, he ends up having a crush on him despite being another man.