Nakano Haruki studying for school falls asleep under the kotatsu, his sister Yayoi snuggled up against him, when Uzuki and Satsuki wake up to give the older brother a good tickling. Oldest sister Mutsuki is all but amused by all the racket this early in the morning, threatening to call mother who is presently overseas, to cut Haruki's and Yayoi's allowance for a month should…