Big Brother

"Nani, are you adopted?" that's a question Nani Kiritsuku has always been asked. She always suspected adoption. But when she snoops in her parent's ancient secret memory box, she finds a letter. A letter written by a single mother to her child, who is she about to give up for adoption. A complete verification. But when Nani digs deeper into her parents history, she finds something she would have never expected.