Kokuhaku Yokou Renshuu Series  

Confession Rehearsal, Yakimochi no Kotae, A Solution to Jealousy, Hatsukoi no Ehon, Confession Executive Committee Love Series, 告白予行練習シリーズ

The Kokuhaku Yokou Renshuu series is founded on the renowned Vocaloid collection by HoneyWorks. At the beginning of the song, Natsuki makes an unexpected declaration, but she quickly retracts it because of her own embarrassment, explaining that it was merely a practice for her genuine confession.