High School DxD HERO

Issei Hyoudou and the other second-year students travel to Kyoto for a school trip intended to provide some badly needed relaxation. Senior and junior members of the Gremory group remain behind, leaving the travelers without several of their strongest allies.

The trip quickly stops being peaceful when Issei and the others come under attack. Without Rias Gremory or the group's usual powerhouses present to take control of the fight, the students in Kyoto have to overcome the threat themselves. High School DxD HERO places the group in a conflict where they cannot rely on the strongest members of their usual team.