Katawa Shoujo by Four Leaf Studios eng uncen
Hisao Nakai was an ordinary high school student and studied there for the past year. Once he finds a letter from the unknown sender in the locker and comes to the specified meeting place. The author of the letter is a girl who loves him, but when he talks to her, he loses consciousness. Waking up in the hospital, he learns that the cause of his fainting is a rare heart trouble arrhythmia, in which there is a violation of the heartbeat. In this regard, parents transfer him to Yamaku – a school for students with disabilities.