Gonna Be The Twin-Tail!! Vol. 6 (Light Novel)

In Vol. 6, Soji and the others have safely returned from their training camp in another world and are enjoying the rest of their summer vacation with Aika’s birthday party and a doujinshi event. However, with the ceasefire period over, the Elemarians begin their invasion again. Meanwhile, Dark Grasper seeks an audience with the leader of the Ultimegil, but what is her true motive? Soji and the others are about to have their hands full with a new threat!
Notice: This book is written in Japanese.