Ui × Kon (初×婚) is a Japanese manga series written and illustrated by Minori Kurosaki [ja]. It was serialized in Shueisha's shōjo manga magazine Ribon from May 2019 to February 2025, with its chapters collected in seventeen tankōbon volumes.

By June 2023, the manga had over 1.9 million copies in circulation. In 2023, it won the 68th Shogakukan Manga Award in the children's category.

Ui, who recently lost both her parents in an accident, enrolls into a unique high school that pairs students together with the intention of future marriage. These student pairs will share a dorm room for three years and compete in a variety of tasks and competitions to prove their love, with the aim of being chosen as the best couple in the school. Winning this competition will not only allow them to partake in a special wedding, but they will also take ownership of the academy—in other words, become rich.

Ui enrolls in this school with the hopes of finding a new family; a person who will welcome her home and love her the way her parents did. However, she is paired with a clever, calculating student named Kon. Kon joined the school for one reason: money. He wants to be part of the best couple and take the big prize, even if he has to fake their relationship.

While Kon is very skilled and succeeds in many of the school's trials, Ui does not make it easy for him. She came to the school to find love, not to help someone lie their way to the top. Therefore, Ui and Kon seek to achieve their personal goals while navigating the unusual events and challenges of this distinctive school.

Written and illustrated by Minori Kurosaki [ja], Ui × Kon was serialized in Shueisha's shōjo manga magazine Ribon from May 1, 2019, to February 3, 2025. Shueisha collected its chapters in seventeen tankōbon volumes, released from September 25, 2019, to March 25, 2025.

By June 2023, the manga had over 1.9 million copies in circulation. In 2023, the manga won the 68th Shogakukan Manga Award in the children's category.