* Based on a manga by Takeda Hiromitsu formerly serialised in Dragon Age Pure, but moved to Gekkan Dragon Age when the magazine was cancelled.

Ooyama Takeru, a mostly normal yet perverted guy, enrols into Tenbi Gakuen — once an all-girls school now turned into a co-ed school. Unbeknownst to him, the only students admitted are those who are able to control a source of energy found in all living things called Element, and thus can use magical artefacts called Maken, giving the users specific and varied abilities.

On the first day, after three years he meets again: Amaya Haruko, his childhood friend, Kushiya Inaho, a weird busty girl who declares she is his fiancée, and Himegami Kodama, a blonde oujo who wants to kill him. On a whim, the school principle Rokujou Minori decides that he and the three girls are to live in the same room. Furthermore, after being persuaded by Haruko, Takeru decides to join the Maken-ki, a special force unit under the school student council, whose responsibility is to mediate duels between students in the school. However, he later finds out that no Maken is compatible with him.

How will his life continue in this school, where the students get into duels that showcase their magic and combat powers, which he apparently does not have?

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Sequel: Maken-ki!: Natsu Da! Mizugi Da! Gasshuku Da!