Yomei Ichi Nen to Senkoku Sareta Kimi to, Kietai to Negau Boku Ga Deatta Hanashi (Poplar Bunko Pure Full)

[Machine Translation] Aono Yuto, a high school sophomore, has been having rarefied thoughts of death ever since his older sister died of a bug-eating disease - an incurable disease that destroys the words in the brain during sleep and causes loss of memories related to them. Every night when he wanders around thinking of ways to die, he sees his classmate Sakurara Furukawa several times in the park. One night, Yuto sees her tears. Later, Yuto decides to commit suicide, but he survives and meets Sakurara at the hospital. When Yuto finds out Sakurara's big secret...?

高校二年生の青野悠人は、姉を虫喰い病―睡眠中、脳内にある言葉が破壊され、それに関する記憶を失うという不治の病―で亡くして以来、希死念慮を抱いている。毎晩死ぬ方法を考えつつ彷徨するとき、公園で何度か同級生の古河桜良を見かけていた。ある夜、悠人は彼女の涙を見てしまう。その後、悠人は自殺を決行するも生き残ってしまい、病院で桜良に出会って―。桜良のある重大な秘密を知った悠人は...?