High School DxD: Summer Vacation

Issei and his friends are enjoying the peaceful days they live in after the terrifying apocalyptic beast Trihexa was sealed away again. Now, a year after the Beast of Apocalypse was sealed, Rias has decided to go to the beach with Issei to relax a little.

The Crimson Princess also invited her friends and co-brides to come along with her and Issei. However, Issei, as usual, ends up taking advantage of the situation, taking advantage of being alone on a beach with his eight brides.