Takeru Ooyama has enrolled at Tenbi Academy, a private prep high school that converted from all-girls to co-ed.

Hoping to have a life full of ogling pretty girls, he reunites with childhood friend Haruko Amaya, who shows him around school.

However, he learns that the school is for students who possess magical and spiritual energies called Elements and who wield crafted weapons known as Makens.

investigation/inspection club), which is part of the student council's Leadership Committee called the Magical Security Organization (魔導検警機構, madō kenkei kikō, lit.

Venus is a mercenary unit that joins Tenbi Academy with the mission to search for the person who is trying to revive Yamata no Orochi.

It is headed by Akaya Kodai, a former member of Maken-ki, and consists mainly of high school aged girls.[ch.

8,9] It is later revealed that Venus has ties to Kamigari, and thus serve as the antagonists for a storyline where they plant barrier stones throughout Tenbi Academy, capture Kodama under the pretense that she trespassed into the Amanohara, and challenge Maken-ki to rescue her.[ch.

21] After Venus leaves Tenbi Academy, they continue their experiments by possessing people and growing monsters to attack the Maken-ki members during their summer training activities.[ch.

[32] Produced by AIC under the direction of Kōichi Ōhata with Yōsuke Kuroda as script supervisor and music by Cher Watanabe, the anime series began its first broadcast run on October 5, 2011.

Following the second season, the series released a five-episode special from March 28, 2014, to July 25, 2014, to Blu-ray/DVD only alongside pillowcases,[54][37] each lasting five minutes long titled Maken-ki!

The episodes feature "never-before-seen footage" including: Haruko Amaya continuously fantasizing about Takeru Ooyama during her morning routine; Monji temporarily giving Inaho Kushiya a cat tail and cat ears during playtime; an unknown student fantasizing about Aki Nijou while in the school infirmary; Kodama Himegami trying on different outfits with Rudolf secretly watching; and Kimi Satō desiring a bigger bust size.