The School Trip Is in Pandemonium
Issei summons his beloved President into the heat of the battle in Kyoto. As she floats before him, Elsha whispers into his ear to poke her boobs. Pressing the switch releases his potential power and Issei challenges Cao Cao once again.
Aired 22/05/2018EP 7 - The School Trip Is in Pandemonium
2018
High School DxD HERO
Issei and the 2nd years attend a class trip to Kyoto for well-deserved relaxation, leaving the senior and junior class students of the Gremory family behind. However, once there, they fall under attack and must win without Rias or their other powerhouses.
(Source: Anime News Network)
Note: Includes episode 0, Taiikukan-ura no Holy.