Chuuya is missing and Dazai has been requested to search for him. Atsushi and Akutagawa are getting closer but something may help or hurt the pair. Things seem normal but a mysterious person is pulling the strings to chaos in the dark.

Akutagawa's mind was running as he woke up to a bright torch in his face. Akutagawa wakes up all healed and alive after the vampire situation has been solved. His given a second chance at life which he ends up spending with Atsushi slowly developing a deeper bond with the weretiger which eventually develops into a crush. Meanwhile Chuuya is dealing with all his feelings for a certain mackerel. Prequel to Experiments to chaos