OVA 6 consists of three separate, unrelated shorts.
In the first short, teacher Misato throws chalk at Shinji for sleeping in class.
In the second short, Rei passes a note in class to Shinji.
In the third short, Shinji and Eva-01 compete over giving a bicycle ride to Rei.
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Ready to Watch Petit Eva ~Evangelion@School, Season 0, Episode 6?