Kindan Shitei de Breakthrough ~Boy Meets Satan~

[robogin123]

Didnt they make this manga just for promotional of the novel?

 

[dinidu456]

https://ncode.syosetu.com/n9185fm/?p=7
if you want to read the novel check here not scam sites dont worry

or you can search on google

禁断師弟でブレイクスルー～勇者の息子が魔王の弟子で何が悪い～ ncode