Kuroki Level is a reference to Tomoko Kuroki's bad class introduction at the start of her second year at high school.

During the class introductions at the start of the second year, Hina Nemoto (a classmate of Tomoko's) told the class about Tomoko and give her praises, before the introduction, thus increasing the anticipation for Tomoko's introduction and giving her the incentive needed to make a good introduction. Despite this, the introduction was not sucessful, and became a joke in the class, with students joking about "Kuroki Level", when talking about something bad.

The joke, however, quickly went out of fashion.

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