Niina Aoyagi is an 11-year-old girl who claims to be in love with Atsurou Itami, a man 15 years older than her. In Niina's past life, she was a girl named Chitose Amamiya, who was infatuated with the same person when they were middle school students. Before Chitose's death, the two had made a promise, that Niina intends to fulfill while hiding the precious memories from her past. Can Niina heal the wounds in both their hearts? [Written by MAL Rewrite] Included one-shots: Volume 1: Koi Baka. Volume 4: Yasashii Tenohira, Machibito