Hakanage.

Sinopsis

Shinoda, a man with a distinctive back tattoo, has been the devoted caretaker of Yuuma since the latter was a child. Yuuma, a sergeant one and a half years Shinoda's junior, has a heart condition that prevented him from experiencing a normal childhood, leaving him somewhat detached from the world. Shinoda has observed Yuuma's innocence, his carefree moments, and his sexual awakening, all while harboring a deep affection for his first love.