Love And Swing 2 (Xenovia Sequel)

The twins Nebula and Xavier are just turning twelve years old as Slifer Yuuto and Rose Vladi just turned twelve and ten. Kiba is bringing all the kids together to give them special presents. These gifts will chance their lives forever as they assemble the Junior Division named Slash 4.

Training, slashing, Issei's fornicating, school life, and much more.

I don't own Xenovia or DxD however the designs of Mr, Nebula, and Xavier Quarta, Rose Vladi, and Slifer Yuuto. Pick up a hard copy of the series sometimes.