Inuzuka has headed home to Touwa for winter vacation—with Persia, disguised as Julio, in tow! But while the two young lovers get into Touwa without a hitch, awaiting them at the Inuzuka household is the family's "guard dog" Shuna, who's bent on ejecting any and all women who come near her fair Romio! To sweep Shuna's suspicions of Julio under the rug, our secret sweethearts have no choice but to pull off the riskiest stunt of all: bathing together...!