After learning about Kaoru's death, Kenji can't stop blaming himself. He had never failed to visit Kaoru's grave for years, until one day, he came across Yuuji, whom he believed Kaoru's younger brother.
Although initially, he just wanted to be Kaoru's replacement, it turned out that Yuuji had a long-time crush on him. Kenji didn't want to hurt his feelings, so he ended up in a relationship with Yuuji.
But things got even messed up when Sakamoto, a trainee at his part-time job, had a crush on Yuuji with an unexpected background.