Ponta is a tail-wagging puppy, the beloved pet of the Koizumi family. Then Grandpa Koizumi invents the Guru Guru Bone, which gives Ponta the power to transform into a human girl. Ponta is immediately drawn to handsome Mirai Iwaki, & even after he discovers that she's really a dog, the two fall head over heels (paws?) in love.
When Mirai's ex-girlfriend stands between Ponta & Mirai, the budding relationship sours. Ponta realises that she can never really be Mirai's true girlfriend, so she runs away. & when the lovers try to reunite, tragedy strikes. Will out-of-body experiences, old flames, & spring fever keep Ponta & Mirai apart?