That's ARIKA

"Sonnan ARIKA" is a promotional manga for the game maker Arika . It's not an official serialized manga by the editorial department, but rather an "advertisement" for Arika. It was serialized in Gamest magazine , but remained unfinished when the magazine ceased publication. It later resumed in Monthly Arcadia . When the author took maternity leave while it was being serialized in Gamest, CLAMP even ghostwrote it for her (because they had a close relationship with one of the members, Tsubaki Nekoi).