A new semester begins where Nagasumi, San and the others are third grader seniors. Everyone got into the same class except Nagasumi got sent to the eighth middle school, class zero where in a classroom full of delinquents. Unable to cooperate with his new class, their homeroom teacher Shark Fujishiro plans to make a killing spree session on his first day of homeroom. Meanwhile, a new student has came to Sun and Lunar's class who turns out to be Lunar's Papa who is dressed in a female middle school attire along with an apron. This disgusts Lunar and makes a whole ruckus in the class. When Seto Gozaburo asks them to quiet down, Lunar's father tells him to not interfere and the two start a fight. Lunar and Sun leave to find Nagasumi and get him back to his seat to clear their situation.
Takahiro Mizushima
満潮 永澄 / Nagasumi Michishio (voice)
Haruko Momoi
瀬戸 燦 / Sun Seto (voice)
Ayumi Tsunematsu
サーたん / Saturn (voice)
Atsushi Imaruoka
永澄の父 / Nagasumi's father (voice)
Takehito Koyasu
シャーク藤代 / Shark Fujishiro (voice)
Noriko Rikimaru
伊院千代 / Class President (voice)
Masahito Yabe
オクトパス中島 / Octopus Nakajima (voice)
Noriko Namiki
永澄の母 / Nagasumi's mother (voice)
Tomoko Kaneda
猿飛 悟 / Satori Sarutobi (voice)
Natsuko Kuwatani
巻 / Maki (voice)
Tessyo Genda
ルナパパ / Lunar's Papa (voice)
Kenta Miyake
瀬戸 豪三郎 / Gozaburo Seto (voice)
Daisuke Ono
三河 海 / Kai Mikawa (voice)
Eri Kitamura
不知火 明乃 明星 / Akeno Shiranui (voice)
Katsuki Murase
政 / Masa (voice)
Sakura Nogawa
江戸前 留奈 / Lunar Edomae (voice)
Makiko Nabei
瀬戸 蓮 / Ren Seto (voice)
Rika Morinaga
銭形 巡 / Mawari Zenigata (voice)
Katsumi Cho
永澄の祖父 (voice)
