Osanakatta Kimi kara no Kokuhaku wa, Jikou desu ka?

Usawa Itsuki spent his youth looking after Kameyama Yui, a younger neighbor who, as a child, promised to marry him one day. When they reunite years later, Itsuki is now her high school teacher. The story explores how their past connection might influence their present relationship. The work was first released as a doujin and later published in five ebook chapters by Otometika Shuppan between July 13, 2018, and October 19, 2018.