Koi Koi 7

Tetsuro Tanaka arrives at Gokoh Academy expecting a fresh start, only to discover that every other student is a girl. The unusual enrollment situation soon becomes the least of his problems when strange and dangerous incidents escalate into attacks involving military helicopters and heavy weapons.

Six girls calling themselves Koi Koi Seven step forward as his protectors. Caught between unexplained threats and the extraordinary group determined to keep him safe, Tetsuro must struggle through a school life in which simply surviving the day is far more difficult than he anticipated.