The Gremory family takes the group to an underworld resort for some relaxation.
If you're looking to watch it, you can find the season on platforms like or Amazon Prime Video . High School DxD New: Season 2 - Vudu - Fandango
While it's largely comedic, the episode also introduces the idea of the characters needing to train for the upcoming Young Devils' Gathering .
True to the series' comedic and fan-service roots, the "trouble" Issei finds himself in usually involves the various girls of the Occult Research Club trying to get his attention.