Sorry for your lost man, I know all to well the pains of losing a pet, all the best.
On the manga: this series sure is goddamn heavy, Jesus I mean I see how she's so messed up if her home life is like that but her brother too, wtf kid study and stop being a beat not your sister full fault, your mom's overbearing, also good friend, the guy about to get his life ruined by a thot lol.