Really wish MC did something about his childhood friend instead of letting her become an asshole. It all could have been avoided if he told her, she was very easy to manipulate and he seems to be the only person she sticks to and when powers became available they grew apart because mc kept his power hidden and those idiots she is with keeps on telling her to not associate with mc.
She is at fault as well but that was the result of MC hiding his power and then he ends up power levelling the madona's of the school, who unlike his childhood friend had stronger personalities and didn't need to rely to subpar classmates who affected her negatively.
There was a part where the childhood friend almost killed her mother because of bloodlust, she would have know about it if mc told her about it but no its her fault for getting mad... well it is her fault but it just shows she didn't know shit about her powers.
MC didn't even need to hide his powers in the first place, nobody on earth could harm him, his parents are dead and the only people close to him are the thre madona's who he power levelled and his childhood friend and her mother which are the only once people could target but he cut them off like a retard.
Anyways this is just my take, just didn't like how the author handled the childhood friend.