Notoyama Keiko

A mystery about the missing high schooler and a young girl.

Eighth grader Ikki lives alone with her mother after her parents' divorce. When her mother died, Ikki was left a billion yen inheritance, and she used the money to fill her loneliness. One day, Sachi, who is the same age as Ikki, picks up on her and makes her a proposal...

Hachinohe Akemi is a single, 30-year-old woman who works at a Japanese confectionery shop. After she helps out 15-year-old Nikaidou Shion who works part time at a local convenience store, Shion starts showing up at Akemi's workplace, but how will Akemi respond when Shion says she likes her?

Misaki seems to be young like others, but she is not! She lives in an orphanage and has an incurable disease. On the occasion of her return to a new school, she decides to shed light on a mystery that has been captive for several years... (from mangaupdates)

Rika Mikuni's parents divorced when she was very young. Her father took her in and raised her without any difficulties, but she cannot easily forget her mother. Then she hears that her mother has remarried and decides to visit her while her father is away on a business trip. In the town where her mother lives, Rika meets a boy named Minamoto Seiya. At first, Rika is surprised by the popular and very forceful Seiya. However, she finds herself liking Seiya, who laughs a lot and expresses his feelings to her in a straightforward manner. But, to her surprise, he is the son of her mother's second marriage! The two are torn between "siblings" and "likes," and the future of their romance is ......? (google translated)

Hinako Midou's parents died several years ago, leaving her alone. Since then she has been passed from relative to another. Now she finds herself about to move to another new home, with a child her own age called Hayami Subaru-chan.

This manga is about the boy group in Japan called, Hey! Say! Jump.