Marin-chan, who everyone mistakes for a highly experienced flirt, as she gives the best advice to girls on their relationship problems (and because of her cute looks). The truth is, she's no more than a whimpy novice who hasn't even experienced her first kiss yet! (Credit for her advice goes to teen magazines and much research.) Her pent-out frustrations were overheard by the school's most outrageous flirt and those two strike up a deal for her to take up lessons to advance in experience...!