Dual! Parallel Trouble Adventure(1999)

Dual! Parallel Trouble Adventure is an anime series following Kazuki, a high school student plagued by visions of fighting robots no one else can see. When the school's most beautiful girl takes notice of him, his life spirals into chaos. A mad scientist kidnaps him and hurls him into a parallel world teeming with robots, aliens, and a boarding house full of attractive girls. Stranded in this strange dimension, Kazuki must navigate impossible odds—injury, insanity, and the slim chance of ever returning home—while piloting giant robots. The series blends sci-fi action with romantic comedy as Kazuki discovers his hallucinations may be more real than he imagined, and his new world offers both danger and unexpected companionship.