Mitsukuni Asamine is a supporting character in Bucchigiri?!. He is the older brother of Matakara Asamine. His name is referenced in the story when another character brings him up, causing Matakara to become visibly tense and react strongly. This indicates that the relationship between the two brothers carries significant emotional weight. Beyond this, no further details are available about his background, personality, motivations, or abilities, nor does he appear directly in the main events of the series.