Roommate to Nazo Hodoki Wo

[Machine Translation] The old dormitory (Asunaro Hall) of Kirimori Gakuin, a boarding school for boys. Due to an "incident" that occurred last year, most of the students moved to the new dormitory, and now there are only six students living there. One of the residents of Asunarokan, Hinata Usagawa, has a new tenant in her room. Eiai Takamiya, a transfer student. He is an eccentric who only opens his mind to animals, but he has an excellent brain. One day, Ryuichiro Koshiro, the student body president who holds absolute power in the school, was murdered by someone in a pavilion on the way to the promenade leading to Asunarokan. The crime could only have been committed by a resident of Asunarokan, given the circumstances of the crime scene...!

全寮制男子校である霧森学院の旧寮「あすなろ館」。昨年起きた“ある事件”のせいでほとんどの生徒が新寮に移ってしまい、今はたった6人の生徒しか入居していない。あすなろ館の住人の一人・兎川雛太の部屋に、新たな入居者がやってきた。転入生の鷹宮絵愛。彼は動物にしか心を開いていない変人だが、優れた頭脳の持ち主だった。ある日、あすなろ館に向かう遊歩道の途中にある東屋で、学内で絶対的な権力を持つ生徒会長の湖城龍一郎が何者かに殺害された。現場の状況から犯行が可能なのは、あすなろ館の住人だけだった―!?