Garten of Banban, but throw in a talking cat and a Japanese vocaloid.

If the Vocaloids are the teachers and staffs in Kamiyama High. Basically an AU.

Ending up in Showdown Town by mistake, Hatsune Miku goes through the city to ask for help: indeed she's going to need it; especially if a particular bear and bird she recognizes are there to save the day!