Heart GearHeart Gear.

Heart Gear (stylized in all caps) is a Japanese manga series written and illustrated by Tsuyoshi Takaki. The series was serialized on Shueisha's Shōnen Jump+ manga website from April 2019 to June 2024, with its individual chapters collected into seven volumes. When creating the series, Takaki decided on using a young girl and robot as protagonists in a post-apocalyptic setting in order to write a science fiction manga that is relatable to a wide audience.