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...
It's not like that! We were in the 
same class last year, that's all!
!كلّا! كنّا في نفس الفصل السنة الماضية فحسب
Unsinn! Wir waren bloß
letztes Jahr in einer Klasse.
No es eso. Fuimos a la misma clase
el año pasado.
No es eso. Fuimos a la misma clase
el año pasado.
Non ! On était juste
dans la même classe.
Ma no! Eravamo nella stessa classe
l'anno scorso, tutto qui!
Não é isso! Estávamos na mesma
turma no ano passado, só isso!
Нет! Мы просто в прошлом году 
были в одном классе.