A SISTER IN DISTRESSNo matter what turmoils Nukumizu Kazuhiko goes through, he always knows his clingy little sister Kaju has his back. But one Valentines Day, the unthinkable happensshe makes chocolate for everyone except her beloved oniisama! Something must be wrong, and Nukumizus got to get the bottom of it. Maybe he could sneak into her school and pretend to be a junior high student? Or maybe hes just got to accept that he perhaps isnt the shining jewel of his sisters heart any longer…