凪との激戦を終えた芽亜里は、葵にある場所へ連れていかれる。そこには家畜を含む多くの生徒たち、そして、三春滝、凪の姿も。この組織は「善咲会」という名で、ギャンブルで学園を支配する生徒会、そして会長である桃喰綺羅莉（池田エライザ）を打倒するためのものだと葵は宣言する。ギャンブルが強い人間に金を集め、生徒会を転覆する計画を立てている葵は、芽亜里をこの善咲会に招き入れたいと申し出る。迷う芽亜里は1日の猶予を持って返事を出すと答えるが、一方で善咲会内部でも様々な思惑が錯綜し、事態は予想もしない方向に向かっていくのだった。
미부오미는 문예부 일행을 '선소회'로 데려간다. 메아리는 학생회를 타도하고 가축 제도를 철폐하려는 학생들의 모임인 '선소회'에 들어올 것을 요청받는다.
After her intense battle with Nagi, Mary is taken by Aoi to a secret place. There, she finds many students, including housepets, as well as Sakura and Nagi. Aoi declares that this organization, called "Full-Bloom," aims to overthrow the student council, which controls the academy through gambling, and its president, Kirari Momobami. Aoi, who is gathering money from skilled gamblers to topple the student council, invites Mary to join Full-Bloom. Hesitant, Mary asks for a day to consider her response. Meanwhile, various schemes and motives intertwine within Full-Bloom, and the situation veers in an unexpected direction.
