Sion-neechan from next door has always been unfriendly, cold, and scary, so I've been a bit wary... But our parents get along well, and since my parents are going on a week-long trip, they've arranged for her to take care of me! Despite her blunt attitude, she somehow spoils me and acts like a spoiled girl! She watches my adult videos with me, calls me out to her part-time job at an SM club... and then I suddenly realize. Could it be that Neechan actually...?! A cohabitation life experiencing the tsundere, busty older sister's subjectivity completely!
