Shingo Kouzuki is 13 years old and the leader of a local gang of kids. Shingo (most frequently referred to as Kouzuki in the series) is essentially Kappei's rival, as both have tendencies to play in the most dangerous ways possible, e.g. fighting each other with anchors. Like Kappei, Shingo is a skilled martial artist. Shingo is a civilian and does not pilot any anti-Gaizok vehicles, but he is nevertheless thrust into the middle of the conflict due to both circumstances beyond his control and through his own actions. Shingo has a mother and a sister, Kaoru, of whom he is very protective. 

(Source: Wikipedia)

There once existed a planet named Beal, until it was wiped out by the mysterious entity known as Gaizok. The few remaining survivors escaped to Earth and split into three families, named Jin, Kamie, and Kamikita respectively. While attempting to start a new life, the collectively known "Jin Family" prepared for the inevitable Gaizok invasion on Earth and its giant mechanical beasts known as "Mecha Boosts". In order to defend their new home, they have built three vehicles which when combined form the mighty Zambot 3. The Jin Family must not only defend against Gaizok attacks, but also harsh criticisms from the very people they protect, who blame the Jin Family for the invasion in the first place.<br><br>
(Source: AniDB)

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Husband of voice actress [Shino Kakinuma](https://anilist.co/staff/96408).