Kumiko & Shingo

This series of manga is about a romance between the dimunitive Shingo and his friend Kumiko in different stages of their lives, from childhood to adulthood. It spans six different manga titles - 5 one-shot manga and a 10 volume 6th series that eventually wraps things up:

1. 130 cm no Dandy
2. Dodgeball wo Shiyou
3. Mirai Yousouzu
4. Step Up
5. Paris de Issho ni
6. Otona ni Naru Houhou (10 volumes)