Onimai

Onimai (逢ニ妹, Onimai) is a city in Japan. It contains the homes of Mahiro and Mihari Oyama as well as all of their extended friends and classmates.

Overview
Onimai is a city located in an unknown region of Japan. Judging by comments made by the cast and weather patterns, it is located somewhere in the northern regions of Japan, as it is cold enough to snow, and Mahiro declares going to the tropical islands in the south far enough to be considered a vacation.

It appears to be a relatively urban destination, with many shops and residential areas scattered throughout. It contains full size houses, where Mahiro and Mihari reside, as well as apartment buildings, where Kaede, Momiji, and Miyo reside.

Shops come in many shapes and sizes. There exist corner stores, street shops such as Lingerie Shop, Hair Salon, and Arcade, and even full sized shopping malls such as Neon.

There also exist schools and universities here as well. For middle schoolers, there is Yotsuba University Affiliated Junior High School which Mahiro and her friends attend. There is also an unnamed high school that Kaede Hozuki attends. Yotsuba University supposedly exists in the city as well given its affiliation with the middle school. The university that Mihari and Chitoze Azuma work at is also there. It is yet to be confirmed whether or not the two places are one and the same.

There is also an amusement park known as Oshimaen which has existed for several years, though it appears to have fallen on hard times as nowadays attendance is relatively sparse.

Places of Interest
TBA

Trivia

 * The name of the city has never been mentioned in the manga. In the twelfth episode of the anime series "Mahiro's Future as a Sister", the city's name is confirmed via a train announcement.