A heated rooftop confession takes place between two men, but not all is as it seems. The good-natured Souta Aoki has had his heart stolen by the angelic smile and kind actions of his female crush, Mio Hashimoto. Unfortunately, he is devastated when she lends him an eraser with another classmate's name—Ida—engraved on top. When Kousuke Ida spots his name on the eraser, he is led to believe that Aoki is the one harboring romantic feelings for him. Aoki is left struggling to clear up the situation alone without revealing Hashimoto's feelings for Ida. Fake and honest pinings mix as misunderstandings abound in this heart-pounding triangle of first loves. [Written by MAL Rewrite]

Kieta Hatsukoi ranked ninth in the 2021 Kono Manga ga Sugoi! for the Female Readers division. It won the 67th Shogakukan Manga Award in the Shoujo category. The series was published in English as My Love Mix-Up! by VIZ Media under the Shojo Beat imprint from October 5, 2021, to October 3, 2023. It was also released in Polish by Waneko from May 10, 2022, to September 10, 2023. The manga was adapted into a live-action drama series that aired from October 9, 2021, to December 18, 2021.