Gonna Be The Twin-Tail!! Vol. 2 (Light Novel)

In Vol. 2, Soji, Aika, and Twoerle have established the Twintails team and Twoerle is hard at work on a new type of hybrid Tail Gear that will give the wearer big boobs. When Aika finds out, she throws her shame out the window and begs Twoerle to give it to her. Meanwhile, the Ultimegil are increasing their strength and a civil war is about to break out between its two factions divided based on boob size. In the midst of the chaos, a warrior girl named Dark Grasper suddenly appears before Soji and the others, and she’s wearing a surprising outfit!
Notice: This book is written in Japanese.