The main character has to take care of 3 kids that his sister has left for him to do, why you ask? Watch and found out. The reason he does this is because his sister took care of him when he was young and despite his sister having a life of her own, she still cares for him.
This anime would make you think "what would you do if you were in his shoes?"
I think this anime shows a great storyline with a realistic plot with great character development and also shows how hard life can be.
