@kingaron seems like its because both possible love interest are badly written and the story has no direction thats why a lot of people put a 1 on it.
People hate Kei cause she treats the MC shit for no reason but simps on the little sister real fking hard
People hate the MC cause he did absolutely nothing besides being the food maker for Himari and punching bag for Kei
The rest of the characters can’t remember what did they do again spoil Himari or something idk. Nothing really happens tbh besides making friends and thats it.
If you want to read making friends 101 type of manga go read Komi-san you can also go for watamote if you want some yuri stuff sprinkled in it but you’d have to read torture first (the good kind) before reaching the making friends part in that manga