Kashuu Kiyomitsu

加州 清光, The child beneath the river
The uchigatana that is said to have been used by Shinsengumis Okita Souji. Perhaps because he was born in an impoverished environment he believes that as long as he keeps himself pretty he will be loved by his owner. Seemingly the polar opposite of Yamatonokami Yasusada with whom he quarrels all the time they are good friends in reality. Source: Official Hanamaru site