Kouno Akira, class president and otome game lover, has decided to never get involved in 3D love. One day she bumps into Sakurasaka Pure who tells her straight that she would be Akira's future "Amore". Not only that, Pure even transfers to her class, follows her around until Akira run off, telling her she does not intent to get involved in 3D love. Pure doesn't give up and tries to fulfill the wish of the 24-years-old Akira, who told her to look after Akira's high-schooler self. "More-than-friends but less-than-lovers", that type of sweet-and-sour youthful story starts here.

Viola is the daughter of a poor noble. One day she receives a sudden proposal…but it's for a contract marriage! Her new husband is the handsome and free super-elite earl, Lord Cersis. And he has a mistress! He'll provide her food, clothing, and shelter, she doesn't need to give birth to an heir, and she's free to do as she likes…With terms like those, she can't say no! Viola's new life as a fake bride starts here!”Can Someone Please Explain This Situation? / Can Someone Please Explain What's Going On?! / Dareka Kono Joukyou wo Setsumei Shite Kudasai Keiyaku kara Hajimaru Wedding / Somebody Please Explain What's Going On Here! / Dareka Kono Joukyou wo Setsumei Shite Kudasai! / The Duchess Of Rosia – A Contract Marriage? How Did This Happen!? / 誰かこの状況を説明してください! / 誰來說明一下狀況！~公爵邸的契約嬌妻