Yuuki's parents divorced 17 years ago, and he has lived secluded with his father ever since. After graduating from university, he began his first job and reunited with his mother, Reiko, for the first time in years. Wanting to cherish this rare opportunity to spend time together, Reiko booked a remote hot spring inn, planning a private mother-son getaway. Though nervous inside, Reiko looked forward to enjoying these intimate moments with Yuuki once again.