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At the end of an uneventful day, Mashiro jumps on her bicycle and heads home.
She is met with an evening shower and picks up the pace when, suddenly... a man jumps out from the corner of her vision, and she crashes into and injures him.
"If your school or parents find out about how you crashed into and injured me, it will surely affect your future prospects." he threatens her... and in exchange for keeping quiet about the incident, requests that she frequent his place to help with "household tasks."
But cleaning the creep's dirty room isn't the only service she's expected to provide.
It's not long before the man starts requesting that she make reparations with her body too...