ある日、自転車店の息子・鉄夫(柴田恭兵)と妹・華子(榊原郁恵)は、黒木恵(渡部絵美)と沢田清貴(北詰友樹)が暴走族に絡まれているところを助けた。そのお礼に清貴の家に招待されることになり、恵と清貴に一目ぼれをした兄妹はお互い2人きりになる絶好のチャンスだと期待していたが、その沢田家は鉄夫と華子の父・太一(山本学)を会社から失脚させた、大自転車メーカーの会長の家だった。しかしやがて華子は清貴に想いを寄せ、鉄夫は妹の幸せを願うために、2人の縁談を阻止しようとする圧力と戦っていく。一方、清貴の父で社長・隆一(高橋昌也)は昔の非情な仕打ちを謝りたいと鉄夫の母・静子(馬渕晴子)を誘い出し、人目を忍んで会うようになった2人はやがて蒸発してしまう。鉄夫と華子は自転車で母を探すが、2人が泊まっていたホテルに踏み込むと、判別がつかぬほど全身に火傷を負った隆一しかおらず、静子は行方不明だった。この事件の真相を解く鍵を握るのは太一の妹・すみれ(泉ピン子)の存在だったが…。
Aliases
Tetsuo, the son of a bicycle shop owner, and his sister Hanako rescue Megumi Kuroki and Kiyotaka Sawada from a gang of bikers. As a thank you, they are invited to Kiyotaka's home. The siblings, who fell in love at first sight with Megumi and Kiyotaka, hope this will be the perfect opportunity to be alone together. However, the Sawada family is the home of the president of a major bicycle manufacturer, who brought down Tetsuo's father, Taichi, from his position at the company. Hanako soon develops feelings for Kiyotaka, and Tetsuo, wishing for his sister's happiness, fights against pressure to prevent their arranged marriage. Meanwhile, Kiyotaka's father, Ryuichi, the company president, invites Tetsuo's mother, out to apologize for his past treatment. The two eventually disappear. Tetsuo and Hanako search for their mother but find only Ryuichi, who has been burned beyond recognition and Shizuko is missing. The key to uncovering the truth lies with Taichi's sister, Sumire, but...