Yotsuga, Kazuki

四加一樹

Kazuki, the protagonist of DUAL!, is treated as an outcast by his peers due to recurring visions of giant robots clashing in the city. Following an accidental transport to a parallel dimension by Ken and Mitsuki Sanada, Kazuki learns he is the sole male capable of operating the mechas. Owing to his exceptional piloting abilities, he is recruited into the Earth Defense Force and assigned as the pilot of the white Core Robot. To maintain his cover at school, he poses as Mitsuki's younger brother, a situation that causes him significant difficulty.
Notably, this world lacks an alternate version of Kazuki Yotsuga. As the series progresses, Kazuki unconsciously activates one of the original alien mechas, a unit named Zinv. It is subsequently revealed that Zinv serves as Kazuki's counterpart within the parallel world.
Kazuki fits the mold of a typical harem anime lead: a timid, reserved, and clumsy ordinary person who wields immense combat strength and inexplicable charm. Consistent with the genre, he draws the attention of numerous attractive women.
Upon Zinv's destruction, Kazuki's wish for the group to remain united leads to the formation of a third potential world, merging aspects from the parallel universes.
Intriguingly, within the Tenchi Muyo! universe, Kazuki Yotsuga is identified as Tenchi's great-great-grandfather.