The true meaning of this song's lyrics are vague and abstract, but it seems to be about a student (Yukari) who is trying to get rid of her schoolmates by telling on them. At the beginning, there are roughly 40 students in the classroom, and she carefully watches each individual to catch them doing anything bad. She declares that she will eliminate every student one by one, until the sole remaining survivor is determined. Finally, there are 0 students left as if a massacre occurred, and she decides to do the same with the teacher. This song has entered the Hall of Legend and exceeded over 40 million YouTube views. Hence, this is Wada Takeaki's most notable song, one of Yukari's most notable songs, and Yukari's most viewed song to date. This song has received a short manga adaptation in the latter's special edition comic anthology. There, while she manages to do away with all of her classmates, the singer never gets to accuse the teacher of misconduct, because someone else secretly recorded her admitting to selfishly discrediting her peers, landing her in trouble as well.
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