High school student Tatsumi lives alone. One day he spots a person while walking by a river. He approaches the figure and discovers a beautiful man collapsed on the ground.
Wakasa begins living in Tatsumi's bathtub. Just having a merman live in his home is difficult enough, but another major problem arises: the living expenses including water for Wakasa!
One weekend morning as Tatsumi heads to the bathroom with breakfast, he hears lively voices coming from inside.The puzzled Tatsumi opens the bathroom door and discovers a mysterious octopus? No, it's Wakasa's friend Takasu.
Tatsumi informs Wakasa and Takasu of a rumor about a ghost appearing in a nearby park. Behind Tatsumi, a mysterious white object appears... The white shadow tells a surprised Tatsumi, "Nice to meet you. My name is Mikuni."
A witch, a vampire, and a mummy... From the darkness, Wakasa, Takasu, and Mikuni appear.When Tatsumi sees Wakasa dressed as a witch, he wonders why. When Mikuni declares, "Trick or Treat," he realizes it's Halloween, but he tells the trio he has no candy. The watchful trio pounces on Tatsumi with a tickle attack! What will happen to Tatsumi? Will Wakasa and his friends acquire any candy?
Wakasa reads his magazines as usual. He had become obsessed with the female fantasy of taking a bubble bath. When Tatsumi enters the bathroom, drags Wakasa out of the tub. Wakasa doesn't understand.
Tatsuhisa Suzuki
Voice
Tsuda Kenjirō
Yuuichirou Umehara
Wakasa
Ibuki Kido
Natsuki Hanae
