Worthy of note: it is hinted that the female protagonist's mother was a teenager when she became pregnant from a 70+ years old man. In the anime, the relationship between the child and male protagonists (the child being the biological aunt of the older man) is not romantic. It is a father-daughter relationship as he starts taking care of her at the age of 6. In the manga, they end up having a romantic relationship with each other when she becomes older. It is not clear how old she is when they start dating. He starts taking care of her when he is in his thirties and they start dating when he is in his forties.