Yakuza Reincarnation Vol 2

Yakuza Reincarnation by Takeshi Natsuhara. An Action manga rated Teen, published in English by Seven Seas in 2022.

Nagamasa Ryumatsu, a big-hearted old yakuza, is killed by young thugs while defending his turf, and is reborn in a fantasy world as the young princess Sanaria Ryu Lundberg. She still has his back tattoo and his strength, and she has zero interest in royal manners. She may also be the only one who can save the realm by teaching it the yakuza code of honor.