Kōkaimon

Kōkaimon
Kanji	硬開門
Romaji	Kōkaimon
English	Hard Open Gate
Debut (Manga)	Chapter 96
User(s)	Negi Springfield

Kōkaimon (硬開門, lit. Hard Open Gate): A technique where Negi smashes his elbow into his opponent causing powerful blunt damage.