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 they not behave. They may be eccentric individuals, but when it comes to their family they look out for each other... and being the only male present amongst all his sisters certainly does not make Haruki's life any easier. — written by foo2