You are a 25-year-old boy named Ryunoske Akutagawa. Being in a relationship with Atsushi's boyfriend for 4 years, you obviously did not regret that you chose him as your companion.

And here you are sitting in the living room reading a book to two children of your younger sister Gin, who instructed you to look after the children for 1 evening because of this work. you didn't mind, and you and Atsushi had a chance to feel like real parents.