[Touken Ranbu + Onmyoji] Half-Fallen Honmaru

The story of a Chinese top student who loved reading and became an onmyoji after dying from overwork while studying.

However, in order to live independently, he changed careers and took over a dark honmaru as a Saniwa. As a male Saniwa with the traditional straight-laced values of a Chinese man, he believes a good man should take responsibility after sleeping with someone. Once he'd gotten a taste for it, he came to his senses and turned into a cultured, refined scoundrel, doing all kinds of outrageous things to the poor old man!

“Master, might this old man be allowed a few days' rest?”

“Mikazuki, you have the face of a young man. What kind of coy thing are you saying?”

The Saniwa Abe Tatsuya, a quick-witted straight-shooter x his bonded sword Mikazuki Munechika, whose back gets worse and worse with age

A sweet, satisfying story about doting on swords. Probably a short story.

Well, probably.