A Touken Ranbu character. One of the five starter swords the player can choose when beginning the game.
Both he and Yamato-no-Kami Yasusada are personifications of swords owned by Okita Souji. When he took the sword into battle in the Ikedaya Incident, Kiyomitsu's tip was broken off during the battle and deemed irreparable, so Okita abandoned him. Kiyomitsu cares a lot about his appearance and thinks looking beautiful will earn him the Saniwa's love and avoid being abandoned again.
His frequent demands for attention from the Saniwa has led to him being portrayed in doujins as being "protago-sexual", falling in love with anyone who is the protagonist of a series, whatever kind of saniwa (male or female, kind or mean, good or evil...).
