Its about an outcast, Koremitsu, that just so happen to visit the funeral of a popular boy in school, and the dead boy, Hikaru, haunted him because he was the only dude who came to his funeral.
Koremitsu is then tasked to take care of Hikaru's lovers, helping them move on from his death.
This isn't a harem btw, at least for the MC Koremitsu, there is only one heroine for him.
Outside of Hikaru's hijinks, the romance of the MC develops really naturally, you can physically feel the emotions blooming between the MC and the heroine, it's an amazing paid off.
Koremitsu is then tasked to take care of Hikaru's lovers, helping them move on from his death.
This isn't a harem btw, at least for the MC Koremitsu, there is only one heroine for him.