Nagasaki in 1986. Young friends Hisada and Takemoto decide to go to Boomerang Island to "see the dolphins". The friendship between the two deepens as a result of this adventure.

Yu feels hopeless in rural life. Impulsively visiting his girlfriend in Tokyo, he ends up staying at "Eden," a cheap lodging with odd residents. After one vanishes, Yu suspects they may be killing newcomers. Can he escape safely?

A popular actor struggling with mental illness and a budding idol—a chance encounter throws their destinies into chaos—finally brought to life as a rollercoaster drama.