A story about a trip to a hot spring with three guys. On the way, they discover the beautiful and sexy Aika hitchhiking in the snowy mountains. They feel suspicious, but decide to give her a ride with their ulterior motives... Aika is excited, but her speech and behavior are a little strange... She says she'll do it to them as a thank you... Lucky for them. From the day they stay at the inn, they're drowning in sex with Aika. Things get out of hand... Aika has a sad secret...