HAJIMARI NO NIINA

11-year old Niina is special. This is because she has the memories of her past life as a girl named Chitose still intact. Among these memories is a promise with Chitose's boyfriend which Niina then decides to try and fulfill. But can she really? (Source: Shoujo-Crusade) Included one-shots: Volume 1: Koi Baka. Volume 4: Yasashii Tenohira, Machibito — Description from AniList community (anilist.co).