Mesu Onahole Seisaku Kiroku ~Idol Saratte Hajimeyou~

The protagonist is an enthusiastic idol otaku. One day, he went to an event of a famous idol, Tsukasa, but was treated as a suspicious person and got arrested. Because of her false accusation, even though he vehemently denied it, he still got a jail sentence. 2 years later, the protagonist is released and vows to take revenge on Tsukasa. [Translated from Getchu]