Anata wo Akiramekirenai Moto Iinazuke ja Dame desu ka?

The days of the losing fiancee are over!

Tsubasa Shiroki and Nanado Amami were just childhood friends, until their parents arranged a "promised marriage" between them. They thought a sweet romantic comedy was about to begin, but…they were separated when Nanado suddenly moved away! However, five years later, they meet again at the start of high school in the spring. Tsubasa tries to tell Nanado about the feelings she still had for him, but standing in her way is Rena Chiba, a gorgeous gal who was Nanado's classmate in junior high! Tsubasa and Rena realize that they both "like" Nanado, and they decide on a contest: "The one who gets him to confess his feelings wins." The two girls, with little knowledge or experience in love, make their first "attempts" at romantic courtship, and they will be inevitably cringey!

(Source: Sneaker Bunko, translated)