On a rainy afternoon, a male high school student awakens freezing on the streets with no memory of how he got there. His classmate and crush, Karen Inukai, finds him and takes him back to her home where, to his surprise, she starts to undress. She seems intent on bathing with him, though he has no idea why. When she holds him once more, he catches a glimpse of himself in the mirror—discovering that he has turned into a dog! Inukai adopts the puppy and names him Pochita. Now, he must adjust to life as a dog and figure out how to get out of this strange predicament. But while he mulls over an escape plan, Pochita sees a whole new side to Inukai that he never saw at school.

Dog Pool. Worried about her weight, Karen Inukai decides to head to the pool and invites her friend Mike Nekotani to come along. Unbeknownst to the dog-phobic Nekotani, their destination is no regular swimming pool—it is a dog pool, where Inukai plans to play with her beloved Pochita. Unfortunately for the trio, Nekotani's fear of dogs soon puts their day of peaceful recreation in jeopardy. Gakuensai Date. The school festival is here, and Inukai has finally gotten a break from working at her class' dog cafe. She takes this opportunity to bring Pochita on a date, but the two immediately run into Inukai's self-proclaimed rival for Pochita's affection, Usagi Tsukishiro, who insists on tagging along. Their tour of the festival attractions soon brings them to a haunted house. When the horrors inside prove too much for both Inukai and Tsukishiro to handle, it is up to Pochita to calm the girls down.