 If you liked
High School DxD
|
 ...then you might like
Sin: Nanatsu no Taizai
|
- op main character
- ecchi demon harem with similar character designs
- reversal of roles (demons are the protagonists & help humans to some extend)
- similar story points & pacing
tbh they are just overall similar - if u like one of them, u'll likely enjoy the other one, although Sin is less story-heavy due to it having only one season