Dark Light Chaser.

Is it really a blessing to have super powers?
Will you choose to be a dark night hero who punishes evil and promotes good, or be an ordinary person who remains unknown?
This is a story that takes place in a parallel world in the 1930s of the 21st century. A young man continues to grow up, accept himself, accept society, establish his own moral bottom line, and slowly integrate into it from a lonely observer outside of society.
(Important point: This is not an invincible and exciting story! If you want to see the protagonist do whatever he wants and kill everyone, don't read it.)