Hiromi Kun!4 Zenkoku So Bancho eno Michi - Haha wo Sagashite Horoki -

[Machine Translation] Super-aged high school student, Hiromi Shiratori, is the fourth in the series! He fights against the yakuza with his 8-year-old henchman! --Hiromi Shiratori ( Riki Takeuchi ) is a 16 year old high school student with a very old face. He follows his grandfather's will to become the national gang leader, and defeats gang leaders from all over the country one after another. While conquering the Hokuriku region, Hiromi meets Tsuyoshi ( Takumi Ikezawa ), an 8-year-old waiting for his mother to return home. By chance, Hiromi decides to take Tsuyoshi as his henchman, but when his sister Aiko (Yuka Asahina) in Osaka tells him that he will fail the final exam or else he will fail and no longer be the leader of the gang, he has to go home temporarily to take the test, which he is not very good at! At that time, the members of the Sugawara clan, a ninkyo yakuza gang on the verge of going out of business in Tennoji, Osaka, come up with an idea to make Hiromi a member of their gang to counter the Kuroiwa clan, an economic yakuza, but Hiromi readily rejects the idea. However, the rival Kuroiwa clan kidnaps Tsuyoshi's mother ( Saki Endo )...

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超老け顔の高校生、白鳥ヒロミ シリーズ第4弾!! 8歳児の子分と共に、ヤクザと戦う!! ――超老け顔の高校生、白鳥ヒロミ(竹内力)、16歳。祖父の遺言を守り、全国総番長になるべく各地の番長を次々となぎ倒していく。北陸地方を制圧中のヒロミは、母の帰りを待つ8歳児、ツヨシ(池澤巧貢)と出会う。ひょんなことからツヨシを子分にすることになったヒロミだが、大阪にいる妹の愛子(朝比奈佑佳)から期末テストに出ないと落第して番長でいられなくなると告げられ、一時帰宅し、大の苦手であるテストに挑むことに! そんな時、大阪天王寺の廃業寸前の任侠ヤクザ、菅原組の組員たちは、経済ヤクザ黒岩組に対抗すべく、ヒロミを組員にすることを思いつくが、ヒロミにはあっさりと断られる。だが敵対勢力である黒岩組が、ツヨシのお母ちゃん(遠藤沙季)を誘拐してしまい・・・。