Chibita and Mame-suke, who are forced to attend summer school because of their poor grades. Seeing a sexy flyer they found on the street, they call a dispatch hostess from a public phone. The one who appears is the giantess big sister "Honoka". Honoka, with her big breasts and big ass, is a libido amplification machine that combines sexual desire and motherhood! The two short virgins devour the white and soft lewd body as they please!