A girl nicknamed "Paingy" invites Tama and Takeshi on a treasure hunt. For some reason, there's a cat that looks like Tama on the treasure map. But all of it is a plan put in place so that Paingy can tell Takeshi something important.

Takeshi is staying home from school because of a fever. Before he knows it, he's hanging out with Tama and the others. The sights and experiences of Third Street from the perspective of cats and dogs is vastly different from what he knows...
I didn't think it was this big!
!لم أظنها بهذا الحجم
Ich hätte nicht gedacht,
dass der Ort so groß ist.
No pensaba que fuera tan grande.
No pensaba que fuera tan grande.
Je pensais pas
que c’était si grand que ça.
Non pensavo fosse così grande!
Não pensei que fosse um lugar tão grande!
Я не подумал, что школа
будет такой большой.