MIMK-069 SIRUMNIUMU was originally a humanistic masterpiece of monogamy.

Lately, I've started to care, early-seeing, inviting me to her room on the night of my school trip, to play King's game with my male friends Kudo, the four men who met in the same room, but I'm starting to get off the track... stripping each other, kissing each other deep, seeing Kudo and seeing her early and even having sex, even though I can have sex with Saku... But the girl I love is in front of someone else, and I'm not in a position to stop the sour and sweet love loss story.