Kaoru Touno's life is in disarray after a series of unfortunate events within his family. Following a tumultuous encounter with his father, he stumbles upon a mysterious tunnel that distorts time. Retrieving a bird resembling his deceased pet, Kaoru discovers the tunnel's rumored power to fulfill desires by trading lifespan. Intrigued by the chance to mend his broken existence, he revisits the tunnel only to be joined by Anzu Hanashiro, an enigmatic transfer student seeking her own wish fulfillment. Together, they embark on a journey of exploration and self-discovery in pursuit of their deepest desires.