The leader Osamu Dazai wanted to create a perfect world where Odasaku was alive. Before the plan was implemented, one day he discovered an independent world where his best friend survived and he and his partner had a child. That world was so beautiful.
So the leader Osamu Dazai used Chuuya and his own blood to artificially create their daughter, Riko Tsushima. Lived a happy life with a wife and daughter.
When Satoko was 10 years old, she wandered to another world and was adopted by Odasaku in that world. She watched her father chase her father and lived a life of chaos. She wanted to protect this world and this happiness.
Concept: Riko's growth history.
