Remembering/Not remembering Sin

Remembering/Not remembering Sin is a text-based adventure about Shunichi Sasaki, a young man who has lost his memory due to higher brain dysfunction. After leaving the facility and returning to daily life, he feels something is wrong with the world he should know and sets out to uncover his past.

As his ability to retain memories declines, Shunichi uses a notepad called a memory note to pursue the truth. You read the story and consult the information recorded in the note, choosing the appropriate entry at the appropriate time.