"Hey, why did you appear in front of me again...?"

Shunya is haunted by the death of his childhood friend Ryousuke, who died in an accident, when a stranger, Tsukasa, a high school student, appears before him, claiming to be Ryosuke. Apparently, when Ryosuke attempted to stop a suicide attempt, he ended up inside Tsukasa. The three are connected by a strange fate, leading to a mysterious shared life together. Shunya is happy to be able to communicate with Ryousuke through Tsukasa, who lends his body to Ryousuke for Shunya's sake. It seems that the three of them will continue to live together forever, but...?

(Source: Kaiohsha, translated)