A monster lurks in the depths of the hotel pool, but it's not half as creepy as the ne'er-do-wells lurking around Nurse Sakura at the beach…

Are aliens invading again? Nope — it’s just Ataru, Meno and Lum’s mothers invading Parents’ Day! But a language barrier may turn this meeting of the moms into pure mania.

Lum’s cousin Ten thinks Lum should look for greener romantic pastures! And if Lum can’t see reason, Ten will burn her relationship with Ataru to the ground.