Hello, I had commissioned Rinruririn to translate this doujinshi.

The original doujinshi I believe has a typo, so I changed Corrupution to corruption.

I included the cover pages due to the fact I was unable to find it in the other galleries of this doujinshi.

I still have Sakuya talking in the blue color to more easily track who is talking, and the Makai Trainer/demon is still in the red color.

The translation starts on page 13. I have also included the pages in which each chapter starts.
Chapter 3: Page 13
Chapter 4: Page 29
Epilogue: Page 48

Other languages and versions:

Japanese (RAW, Digital): https://e-hentai.org/g/2491559/0cec4271d4 (uploaded by singesu)
Chinese (Translation, Digital): https://e-hentai.org/g/2417372/05b993119c (uploaded by saruman2002)