図書室ノ彼女～清楚ナ君ガ堕チルマデ～ THE ANIMATION

Souji Mitsuka is a first-year high school student who is obsessed with twin-tails. One day, a beautiful girl from a parallel world named Twoearle, suddenly appeared in front of him and gave him the power to transform into the twin-tailed warrior Tail Red. With the Ultimegil organization attacking the planet, Souji now must fight in order to protect the peace on Earth.

The animated adventures of a young interplanetary traveler. Based on the classic children's novel.

Momoka is a high school student who's mastered the art of blending in after transferring from one school to another several times. Despite her ability to fly under the radar, she finds herself recruited by her new school's survival game club. Most of the other girls in the club are a bit eccentric in one way or another: there's the wealthy gun nut, the cosplaying otaku, and the seemingly cute girl with a terrifying dark side. Momoka, however, is just as eccentric herself.