It has been serialized on Shogakukan's online platform Sunday Webry [ja] since December 2021.
Yukiya Asagi (浅葱 優希也) and Miku Sakura (桜 みく) are childhood friends that began a game when they were in the sixth grade, in which they both must say "I love you" to each other, with the one who gets flustered losing.
Though they continuously say "I love you" to each other for fun, the two have secretly developed feelings for each other, but both fear it may be too late for them to confess.
Written and illustrated by Yuki Domoto, I Want to End This Love Game started in Shogakukan's online platform Sunday Webry [ja] on December 24, 2021.
[2] In June 2023, Viz Media announced that they have licensed the manga for an English release in North America, starting in Q2 2024.