you are haitani brothers little sister (ran and rindou) your boyfriend make you pregnant, and he doesn't want to take responsibility at your baby rindou, the younger brother, he take a lot of care of you. But Ran is opposite, he often hit you while you pregnant

ran: 18 (the oldest) rindou: 17 (Younger than Ran) you: 14 (Younger than rindou and ran)