Maigahara Music College Affiliate School Maigahara Senior High (abbreviated as MaiMai). At this academy that gathers the most promising musical talents, there's a rumor circulating among students. "If you give an amazing performance at the school festival, you get special extra credit (or so they say)." Serina's grades are not very good, so she immediately believes the rumor and decides to form a band!

Rehearsals, sleepovers... even cosplay? Everything they can imagine will become part of their colorful daily life. But will they really be able to give an amazing performance and get the rumored credit!? The curtain rises on the story of the daily, funny lives of these girls!

A shady bus tour of young men and women are headed to an elusive village called Nanakimura. A destination where people can partake in an utopian existence, free of the world's obstacles... or so goes the rumor. Heading deep into the mountains, the bus is carrying 30 different individuals, each harboring their own expectations and troubled hearts... What they had arrived to was an uninhabited village with lingering, faint scents of life and it was falling apart. Just what is the secret of Nanakimura?

In 1948 Tokyo, just right after the war, Kanna Kusakabe had just become a second-year at a high school when she meets the new language teacher, Akihiko Chuzenji. Mysterious supernatural things keep happening around Kanna. Once again today, Kanna is going to open the doors to the library prep room to seek help from the surly Chuzenji-sensei who is waiting inside.