If you're looking for manga similar to Starlight Scramble Renai Kouhosei, you might like these titles.
Minagoroshi takes place prior to the game's prologue and follows the story of Minato Kageaki arriving to a remote island and fighting a group of four Mushas to destroy one of Ginseigou's "Eggs."
Time flies by; Hiroyuki and Akari are 12th-graders now. Both of them and their friends have grown up gradually in someway, physically or mentally, but one of their best friends is missing: the lifelike android Multi. To their surprise, Multi is brought to their campus again without notice, yet she is no longer the same Multi they have known.