“"Sometimes there are loves that don't work out no matter how hard you try. You just have to say "Congrats/Best Wishes to the person I loved". But love can always begin to move once more..."” —Author's comment
"Kokuhaku Rival Sengen" was uploaded onto Niconico Douga and YouTube on February 14, 2014. It has entered the Hall of Legend on Niconico and reached over 20 million views on its YouTube upload.
This song is part of Honeyworks' Confession Executive Committee Love Series, and serves as the eleventh uploaded installment. It tells the story of Ayase Koyuki, a feminine and shy boy who fell in love with Enomoto Natsuki. In attempt to try winning her heart, he cut his long hair and stopped using his glasses, but even then, he didn't succeed and Natsuki confessed to Yuu, who returned her feelings. In the very end of the video, Yuu's younger sister, Hina, is seen with a love letter in hands. The story behind Hina's love for Koyuki is further explained in Ima Suki ni Naru., when she tries to deliver him the letter.
This song is featured in Honeyworks' album VocaColle3. A version sang by Koyuki's voice actor, Yonaga Tsubasa, is included in HoneyWorks' second major album Boku Ja Dame Desu Ka?.