Arakawa Under the Bridge - Kou Ichinomiya is the son of a wealthy businessman who holds a firm belief in his elite status. As such, he is determined to avoid becoming indebted to anyone; but one day, after a run-in with some mischievous kids on Arakawa Bridge, he ends up falling into the river running underneath. Luckily for him, a passerby is there to save him—but now, he owes his life to this stranger! Angered by this, Kou insists on paying her back, but this may just be the worst deal the arrogant businessman has ever made. The stranger—a stoic, tracksuit-wearing homeless girl known only as Nino—lives in a cardboard box under the bridge and wants only one thing: to fall in love. Asking Kou to be her boyfriend, he has no choice but to accept, forcing him to move out of his comfortable home and start a new life under the bridge! 荒川アンダー ザ ブリッジ - 主人公・市ノ宮行は世界のトップ企業社長の御曹司。幼い頃から父に「他人に借りを作るな」と教えられ、その教え通りに借りを作らずに生きてきた。 しかし、ひょんなことから溺れかけた際、荒川河川敷に住むニノに命を救われる。「命の恩人」という余りに重すぎる借り。その恩返しといてニノが行に要求したのは「私に恋をさせてくれないか?」という事だった。こうして行はニノの恋人となり、自身も橋の下で生活することになる。 荒川の橋下では常識から外れた人々がいっぱい住んでいた。行は「リクルート」という名前を与えられ、橋下の住人の一人として暮らす事に……。
