In the sequel novel's story, The Tatami Galaxy protagonist's trouble-making friend Ozu gets the student apartments' only air conditioner remote control wet, breaking it on a certain midsummer day. The students wonder what to do about the situation for the remainder of the summer and make a plan with Akashi. An unstylish male student from 25 years in the future arrives in a time machine. The protagonist travels back in time to try to retrieve the remote control before it is broken.
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