Gonna Be The Twin-Tail!! Vol. 4 (Light Novel)

In Vol. 4, the Twintails battle the Elemerinas and Wormgildy, but the real battle begins after the battle ends and Soji realizes he can’t transform back to his male form! Now a beautiful twintailed girl, he changes his name to Sola and begins attending school under the pretense of being an exchange student until he can find a way to change back. In the meantime, he’ll have to get used to daily life as a girl, fending off monsters and the obsessed members of the newly formed Sola Fan Club all the while!
Notice: This book is written in Japanese.