告白ライバル宣言 (Kokuhaku Rival Sengen)

Background
It 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. 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,, is included in HoneyWorks' second major album Boku Ja Dame Desu Ka?.