Dual! Parallel Trouble Adventure

Kazuki Yotsuga sees visions of a parallel world where giant robots clash, unnoticed by others. Introduced to Professor Ken Sanada by his daughter Mitsuki, Kazuki learns Ken’s quantum physics experiments may connect these realities. When Mitsuki accidentally triggers Ken’s portal device, Kazuki is thrust into the alternate world. Unaware of the shift, he’s nearly crushed by battling robots. During a skirmish, the Hartzenen robot crashes, and its injured female pilot collapses in Kazuki’s arms. Forced to take control of the robot, Kazuki enters the fray, discovering his unique ability to pilot it.

Stranded in a parallel world, Kazuki searches for the injured pilot, Yayoi, but finds she’s been taken by UN forces. Returning to his home, he’s shocked to find his parents don’t recognize him and his belongings are gone. Captured by soldiers led by Mitsuki, Kazuki learns he doesn’t exist in this reality. Ken Sanada, a UN Global Defense Force leader, reveals Mitsuki arrived a month earlier and is a core robot pilot fighting the Rara army, led by scientist Hiroshi Rara. As Kazuki grapples with his displacement, he faces the reality of a world at war.

Persuaded by UN Inspector Akane and Ken, Kazuki becomes the Hartzenen’s pilot, astonishing the team since only females can typically operate core robots. Meeting the alien D, Kazuki trains to control the robot alongside Mitsuki and D. His first battle is terrifying, but when his teammates face danger, Kazuki overcomes his fear to protect them, proving his potential. As the UN marvels at his unique ability, Kazuki begins to embrace his role in the ongoing war against the Rara army.

To conceal Kazuki’s identity from the enemy, Ken designs a female uniform for him, as he has no place to stay in this world. The base’s laughter at his disguise embarrasses Kazuki, prompting him to flee. Encountering Yayoi, who returns his jacket from her rescue, Kazuki reluctantly agrees to wear the suit once, with Ken promising a male uniform for future battles. Akane urges him to comply for secrecy, as Kazuki navigates his new life and the challenges of blending in at the UN base.

Posing as Mitsuki Sanada’s brother at school, Kazuki is overwhelmed by male students vying for her attention, leading to tension when he accepts their love letters. Mitsuki, annoyed, assigns him to respond to each one. When D moves into their home, Mitsuki builds a wall to separate her from Kazuki, frustrated by D’s preference for his instructions. A mix-up with Mitsuki’s diary escalates tensions, but a rainy search brings them closer. Yayoi’s arrival as their neighbor complicates their daily routine, testing their group dynamic.

Jealous of Yayoi’s growing presence, Mitsuki schemes with Reika to arrange Yayoi’s marriage to a wealthy businessman. Yayoi resists, but Reika insists on a meeting near a Rara army battle zone. Despite warnings, the meeting proceeds, and Kazuki’s battle inadvertently disrupts it, delighting Yayoi. During the chaos, Kazuki saves Miss Ra, an enemy, from falling, hinting at unexpected connections. Mitsuki’s plan backfires as the team faces the consequences of their actions in the escalating conflict.