How can you add a trigger element that induces a bite to the action of a straight worm that tends to be monotonous? Kirikake is a completely new straight worm that embodies this proposition with KAESU-style ingenuity and ideas. The characteristic notched tail opens and closes instantly with a slight water flow, and realizes the unique effect of slightly vibrating left and right when the water flow resistance becomes strong. In shaking, the ultra-thin tail invites you to flutter while bending the body more, and in lift & fall and swimming, it changes its form like the tail fin of a small fish and creates high pitch vibration.