Asdflimo
Arata Kurosawa is a teenager, lives alone, and is probably the most academically gifted student in his school, and he's very well aware of it.
When the school offers him a tutoring gig: A better living situation, a stipend, and something for his record, he takes it without thinking twice.
"How hard could five failing students really be?"
Extremely hard, as it turns out.
The five in question are sisters, technically. Three of one kind, two of another. None of them asked to be a family, and none of them asked for him either.
One refuses help from anyone, one has completely given up, one is so anxious she can barely look at a test paper, one has a grocery budget and no time for his nonsense, and the last one started this whole mess.
Oh, and apparently he used to know them. Funny how that works.