Princess Nakaba of Senan is forced to marry Prince Caesar of the enemy country Belquat, tantamount to becoming a hostage. While Caesar is pleasing to the eye, he is also selfish and possessive, telling Nakaba outright:

In the era of space exploration. Mankind is at war against monsters of unknown origin. The battle is grim, and the future looks bleak. Amidst the chaos, mankind plays their last hand; it's time for the Knights to step into the fray and turn the tide of t

Shiro, a laid-back and absentmindedly seductive umbrella craftsman, is (surprisingly) a close friend of Koujirou, a hot-blooded young police officer who stands against all things undisciplined. With their mutual knack for attracting trouble, the pair soon