Sotsugyo

is a Japanese light novel series written by Mami Watanabe, with illustrations by Masaki Takei. The series began publication on December 10, 1993 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Seika Girls High School boasts a long history. There are five problem children in Group B in the third year: Reiko, Shizuka, Mami, Seimi, and Minatsu. Each is unique, and the only thing they have in common is their personality that doesn't fit into the frame. I often act together to see if they call each other. Even before the summer vacation, Reiko declared to everyone. "Hohoho, this time my family will be a horse owner. I'm going to invite you to the Hidaka villa I bought for that purpose." I decided to accept the invitation, but Seimi and Minatsu had their own plans ... A special graduation edition set in Hokkaido. The last summer vacation in high school.