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"Am I not good enough?"
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Kokuhaku Yokou Renshuu ZERO (告白予行練習 0巻, Confession Rehearsal Volume 0) is a one-shot manga made during Confession Executive Committee's Kokuhaku no Oto era, providing an initial backstory to the love dilemmas of "Hatsukoi no Ehon", "Kokuhaku Yokou Renshuu" and "Yakimochi no Kotae", and properly combining them all into one narrative. The comic also came with character profiles of the six main characters, which included a profile that introduced Hina Setoguchi to the franchise before her proper debut in "Terekakushi Shishunki".

This comic was originally sold at Comic Market 84, released on August 12, 2013.


The manga serves as a prologue to "Kokuhaku Yokou Renshuu", but also incorporates moments from the other two music videos as well.
In the beginning, the class is having their PE time, while Sota gets hit by a stray tennis ball. Afterwards, Natsuki and Yu find time to talk in an empty classroom. After Natsuki tells Miou and Akari her feelings for Yu, they begin to talk themselves about their own boy troubles. Miou still hasn't gotten anywhere with Haruki despite liking him, while Akari answers that she doesn't think much of Sota romantically at all, but keeps it as a possibility. By the end of school, the girls meet up with Yu and Sota as they're walking down the hallway. Natsuki calls Yu out to meet him after class, so that she can tell him something important, which the boy readily agrees to. While all of the characters are thinking about their respective loves, the manga ends on the very beginning and first line of "Kokuhaku Yokou Renshuu", with Natsuki confessing her feelings.



  • At this time, the groups were all still second years in Class 2-3, and took place before HoneyWorks decided to turn them all into third years.
  • Despite Haruki having "Hatsukoi no Ehon -another story-" by this time, his character profile links to a duet featuring both the original "Hatsukoi no Ehon" and the -another story- covers used in its debut album, Haniwa Kyouku Utattemita 2.