once taught at a rural school, kazunari, fumiya, and shira. at the time, kazunari was worried about his father's health, who had fallen ill, and was struggling with the prospect of being transferred to tokyo. fumiya took over the transfer instead. kazunari and shira, who were spared the transfer, got married. since then, they had become estranged from fumiya, but when they contacted him after a long time, they found out he had fallen ill and retired. kazunari and shira invited fumiya to their home. taking advantage of kazunari's absence, fumiya approached shira. unable to strongly refuse the person she owed a debt of gratitude to, shira...