From Seraphic Deviltry:
There was a confession letter in the time capsule that my childhood friend and I buried.While office worker Buntarou is on his way to his hometown for summer vacation, he reunites with his childhood friend, Ittetsu, with whom he hasn’t spoken in fourteen years.
Inspired by the letters from the time capsule, Buntarou and Ittetsu entwine their bodies as they start a relationship that they call a “thoughtless love affair”…
This summer’s encounters will heal the wounds that they’ve carried in their hearts without knowing it.