Mirai to Kare to Papa Jijou

One night, Mirai was suddenly handed a ring by a pink-haired boy who was standing in front of a fountain. Her father is remarrying and when they moved into their new house, she was surprised to discover that her father's partner has a son and it was none other than the pink-haired boy from that night! Just how will Mirai fare in her new life living with two fathers and a boy her age?