Ever the manipulative person, Nabiki Tendo finds herself being watched by a mysterious figure. She discovers that the figure is Kinnosuke Kashao, member of a lesser known Kashao School of Martial Arts. They go for a date where they spend lavishly and where Nabiki believes she finally found a stable source of income. It isn't until the date is over that she realizes that Kinnosuke actually used her family's money to pay for everything. They arrange a second date with an extra challenge: the first person to spend 10 yen on the date must pay for all the damages done before and during the date. With that, they go around spending as much as possible while also beginning to fall in love with each other. Even after they profess their love they continue their battle to the point where Kinnosuke re