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Four decades after the COVID19 pandemic, the Japanese Government has gone to extreme lengths to increase birthrates. Being a Japanese student has become one of the most stressful jobs in the world.

Yuzuko Shikumi is seventeen, married to Hiroki and has a little boy named Koichi. The stress of school, motherhood and working for her grandfather's IT firm makes Yuzuko confide in her best friend, Sakura Kanagawa, which results in an affair.

The two women continue to bond despite the fact that Yuzuko is married. As much as Yuzuko wants to be public with Sakura, Yuzuko knows the devastation it will have on both of their families if their affair is exposed.

This is a prequel to Game of Mass Destruction.