Kei Kusanagi spots a peculiar shining woman beside the lake one day. He learns that the woman is an alien officer from the Galaxy Federation named Mizuho Kazami, and even more shockingly, she is also his instructor! Despite this setback, he and his teacher eventually become acquainted, and a romance grows between them. However, the principal of the school quickly discovers their relationship. What is the solution? Obtain your marriage license!