@@This story will be to test out my knowledge in Highschool DxD and to mix up some ideas with Highschool of the Dead. In this story anything goes. Basically, there will be multi-verse travel and other system powers. The MC can also summon a wide range of weapons and build fortress' to protect him and his harem. In this story, Takashi(MC) is related to one of the devils in Highschool DxD. So this story is just for fun and to get a better idea about Highschool DxD.
If you have any source material you want to recommend let me known.
I have watched some of the anime of Highschool DxD but not all of it. So let me know if I should watch the anime or read the manga.
If you have any other questions then ask away. First chapter comes up today.