It has been serialized in Shogakukan's seinen manga magazine Monthly Sunday Gene-X since July 2019, with its chapters collected into sixteen tankōbon volumes as of December 2024.

An old school, good-hearted old man yakuza, Nagamasa Ryumatsu, is still hellbent on defending his turf when some young thugs ambush him and he ended up losing his life.

He wakes up in a fantasy world in the body of a young princess, Sanaria Ryu Lundberg, retaining his back tattoo and strength.

Ryu might be out of place in this fantasy realm, but she may also be the only one who can save it by teaching this new world the meaning of yakuza honor.

[5] In July 2021, Seven Seas Entertainment announced that they had licensed the manga for English release in North America, to start publishing in March 2022.