He seeks no ups and downs in life or in his emotions. He spends his days without any expectations, but then a beautiful girl, Saya, who is the complete opposite of him in every way, approaches him. She has it all: good looks, popularity, and happiness, but for some reason, she suddenly and unilaterally declares that she and Kento are dating. Moreover, she even kisses him. ...? The flat darkness is filled with swells and sparkles! For those of you who despair of the cramped world, Atsushi Uchiyama of "I Can't Choose Between the World or My Girlfriend" presents you a coming-of-age big bang read!

人生にも感情にも何の起伏も求めない。一切の期待を捨てて日々を過ごす健人の前に現れたのは、自分とは何もかもが正反対の美少女・沙夜。容姿も人気も幸せも全てを持った彼女が、なぜか突然一方的に健人と交際宣言。しかもキスまでしてきて……？平坦な暗闇にうねりと煌めきが訪れる!?窮屈な世界に絶望しているあなたへ、『世界か彼女か選べない』の内山敦司が贈る青春ビッグバン読み切り！