Shintaro has graduated from intermediate school and successfully enrolled in Yawaza with his big sister Mariko and the other Akindo members who decide to celebrate this milestone with a trip to a mountain resort. Everybody is galvanized by her euphoric expectations and his libido about the upcoming due to the talk about the upcoming journey. Mariko is not thrilled about Ayumi's presence and is unwilling to behave toward her as a fellow Akindo member; the resulting argument exacerbates the bumpy bus ride to the Takaya Hotel where it is explained that there are none of the common creature comforts endemic to most lodging establishments...