Boku-tachi Futari ga Koisuru Riyuu

High school student Naoyoshi works a part-time job helping the elderly. However, one day, he receives a request to help Norihiko, a young man suffering from an illness. The pair develop a close connection, but Norihiko abruptly disappears, and Naoyoshi can't seem to contact him for an explanation. When they finally reunite, something seems different about Norihiko.