@ Eratas: Childish slapfight? That, or physically cling to Yuriko for the duration of his stay.
She also spies on her "older" sister, Koneko, who's younger than her at the time even though she is technically older then her, for blackmail when she returns to the future.
Cue Kyuukai having a panic attack and combing the academy inch by painful inch as he searches for his daughter who just went "missing".
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