It was a manga about a relationship teacher-parent. The teacher was going to the houses (i think) of her students to talk to their parents (or something like that), then she was going to the house of her next student, a delinquent girl, then the mother of the delinquent received her and the teacher notices how frail and skinny was her. Then they chatted about her daughter and i don't remember the rest...
Another thing about it is that, for some reason, i remember it having a tag like "ParentxTeacher", but then it didn't appear when i searched for it, so i just concluded that i was seeing things...