Iori is the eldest son of four brothers of the Kobayashi family.  He decided to move to Tokyo to attend college.  While he looks for an apartment, he finds an ad that says "live-in house keeper in exchange for free rent."  This was a perfect opportunity for him and he lands on this wonderful gig.  Growing up with 3 other kids in the family, he's used to taking care of other people, he can cook well, he is good at cleaning and he can save money on rent.  
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