おくすりのんでもなおらない

The main character, Kanata, goes to a psychotherapist once a month.
One day at the hospital, he happens to meet a classmate, Wataru, and they become friends.

However, Wataru is...

"All mentally ill people cut themselves, don't they?" "You're not really depressed if you don't cut yourself, are you?" "It seems like you haven't been medicated at all, so maybe your depression is a lie?" "There are people like that, huh? People who want attention, so they pretend to be sick." "If you've never overdosed or cut yourself, it's weird to say you're mentally ill." "Don't you think it's disrespectful to people who are really suffering from illness?"