Reincarnated in Another World...Not!(2019)

Isekai Tensei... Saretenee!

Kosuke Yuki, an ordinary high school boy on his first day of school, He saved an old man (actually God) who was almost hit by a train and died. As an apology, he was supposed to be reincarnated in another world with God's cheat powers, But he was accidentally sent back to the real world. ...... cheating ability as it is.

Since then, he has been involved with a crazy criminal and has been noticed by a beautiful girl who is the class representative, and finally got involved in a shady Onmyouji war, The days are hectic and he is involved in a shady Onmyojutsu war. Will Kosuke's dream of a peaceful school life be shattered in an instant?

(Source: MangaPlaza)