Mahou Shoujo Ore

is a Japanese manga series by Icchokusen Mōkon, which serialized in Fusion Product's Comic Be magazine in 2012, and was collected in two tankōbon volumes. The series was renewed for serialization in the same magazine in 2014. An anime television series adaptation by Pierrot+ premiered on April 2, 2018.

Plot
Unpopular idol and high school student Saki Uno becomes a "magical girl" after inheriting the position from her mother. With the help of a Yakuza-like mascot character named Kokoro, Saki is able to transform into "Magical Girl Ore" to fight the cute-faced demons who threaten to kidnap her crush, Mohiro. Unfortunately, her magical girl form is that of a large, muscular man in a small, cute, girlish uniform, causing endless embarrassment to Saki. The situation becomes even more complicated when Mohiro becomes attracted to Saki's manly "Ore" form, and Saki's idol partner Sakuyo reveals her own attraction to Saki's female civilian form.

Other Sources

 * Official (anime) site