Falling off a bridge while trying to get his pants back Ichinomiya Kou is saved by a woman named Nino. Desperate to live up to his family motto of never being indebted to anyone he tries to pay Nino off only to find that she is completely uninterested in his riches and prefers living under the bridge.

Desperate to the point of panic to be rid of his debt to her he asks if there is anything she wants. "Could you fall in love with me," she responds and so Kou ends up living under the bridge as well doing his best to fall in love with her.

Recruit is introduced to the other people living under the bridge. He finds out from Sister that the rest of the inhabitants want to kick his ass for being Nino's lover.

Rec is interrogated by Sister and Hoshi about how far he has actually gone with Nino. To their frustration he admits that absolutely nothing has happened. Realizing that to pay off his debt to Nino he has to do more to act as here lover he decides to take her out on a date, using all of his rich guy power to impress her.

Riku and Nino go on their first date. Later Stella the little orphan girl arrives and challenges Riku to a game of play fighting. After a humiliating defeat at the hands of Stella Riku and Sister go to see Maria the riverside farmer.

After discovering Sisters one fatal weakness Riku meets P-Ko the resident vegetable farmer and local clutz. Afterwards the bridge holds a welcoming party for Stella and Riku tries to convince the mayor to give Stella a new name in a bid to reveal her true nature.

Ric discovers that he is actually quite good at teaching, at least in comparison to Nino's "advanced" swim lesson. He decides to make his official job teaching so that he can "correct" the inhabitants under the bridge and escape back to the sane world.

Ric starts his first day as a teacher. Nino and the helmet brothers show up for class, but everyone else thinks up a way to get away from Ric's "helpful" instruction. Stella tries to muscle Ric out of her territory as the day progresses.

Ric is visited by his secretary from his outside job. Thinking quickly he comes up with an elaborate lie about why he is under the bridge only to have it fall apart within minutes. Later he shares his first kiss with Nino. Unbeknownst to Ric his father is aware that he is living under the bridge and sees his actions as a affront to the family name.

Riku learns more about the past life of Star. Stella discovers that Sister is in love with Maria and a battle of epic proportions ensues.

Sisters holds a fire drill involving a real fire. Riku's father beings his plan to correct his fallen son by evicting the residents under the bridge and to renovate the riverside.

Sure now that his father is behind the plan to evict the residents under the bridge, Ric decides to launch his own counter proposal and turn the area into a park so the resident can stay.

However his fathers reputation and the "help" the residents scare away Ric's contractor. At the same time the "horrifying" weakness of his father is revealed, will Ric discover it in time?

Ric and Star become shooting stars and Nino makes a wish upon them. A mysterious man appears and derails Ric's father, Seki, plan to redevelop the riverside. Thinking that Ric was behind his failure he comes to the river to confront Ric.

He succumbs to the same fate as Ric and encounters Nino, though he remains true to the family motto and refuses her help.

Ric finally works up the courage to call his father and tells him even if wins he will still love Nino, Nino learns how to answer a phone.