Gonna Be The Twin-Tail!! Vol. 3 (Light Novel)

In Vol. 3, Dark Grasper appears before Soji and the others in order to recapture Twoerle, and Soji is bewildered by her Glass Gear that uses the moe power of glasses. Meanwhile, new Twintails member Erina Shindo is having a hard time balancing her new duties as a hero with her everyday life. As a result, her mom Emu begins searching for a groom for Erina whom she will marry when she turns 18. Feeling bad for her, Soji and the others try to intervene, but things go in an unexpected direction!
Notice: This book is written in Japanese.