The Sun Breathing Swordsman's Search for Family

I am Tsugikuni Yoriichi. I had an older brother, but I made a complete mess of our relationship. Then I died.

When I opened my eyes, I had a second older brother.

His name was Ubuyashiki Tsuya.

He was also known as

Kibutsuji Muzan.

Oh, so it's you.

Muzan has his memories too, but in this life, he'll be taught how to be a decent person and how to develop a proper set of values.

My version of Yoriichi, my version of Muzan.

The story of how Tsugikuni Yoriichi teaches Muzan to be a decent person.

More older brothers may be added later.

Also, this is a crossover, and maybe there'll be a little quick transmigration, depending on how I feel.

One more thing, to be clear! Muzan is not a romantic pairing! He's not!

That's all.

Theme: If some things cannot be changed, cut out the root and start over