Kaiju Girls: Isekai into Kaiju Girls.

Vincent Blake, an aspiring Gunpla Builder, and fighter had just witnessed his friend A.I friend Lilin get kidnapped at the hands of Chaos, after this event as he was heading home from school when he met the Isekai truck, sensing this Lilin latched herself onto his soul through his Gunpla. Now awakened as a newborn in a world of giant humanoid female Kaijus called Titans. He must make a new life for himself in this new world as he works to improve the Jaegers that have been made to fight Kaijus, and Titans alike.