Why? The seven deadly sins a King self harm fan fiction (completed want sequel)

King thinks that he is useless and he isn't needed.
All the sins he committed have put him in the state of depression
and he can't take it anymore and wonders why he is still alive.
He thinks Diane doesn't care about him because she's in love with the captain.
None of the sins know what King does and he thinks they would be happier without him.
" No one would care if I die......no one would even notice me gone......."