Chuuya Idol!

Chuuya, an idol, has a hybrid at home whom he found when they were teenagers while singing in a park; Dazai was inside a box with nothing but wounds and broken bones.

Chuuya took him into his home and now he's his partner and companion, leaving him at home while he sings.

After years she continued that dynamic, only this time she made him her husband and even puts him on a diet for medical reasons (something Dazai hates)