Just like Kuzina, Issei is exposed to an environment where he needs to learn fast. But, instead of fighting a bunch of aliens, Issei is in a world full of angels and demons. Plus, High School DxD is like Masou Gakuen HxH 'cause both series have a lot of beautiful girls that can fill your wildest dreams!

In Masou Gakuen HxH, Kuzina needs to train hard to lead his magical warriors into combat. Well, in 'So, I Can't Play H!' Ryosuke has his own training. But his training involves studying to control his libido from his pervy powers. Both shows have cool plots, tons of comedy, and a lot of ecchi moments!

The Testament fo Sister New Devil has the same type of machinery that Masuo Gakuen HxH has. By machinery, we mean that both protagonists need to do whatever they can to help the girls access their powers. Kuzina needs to arouse them for their Hybrid gear while Touji has a lot of women crawling all over him almost every time.