In a ruined world, a human girl, Lu, and a droid, Zett, live a humble life. Then one day, they encounter a mysterious new droid, Chrome... Now all three of them live together like a family, but then... (Source: MANGA Plus)

Heart Gear was simulpub in English through MANGA Plus. The volumes were published by VIZ Media under the VIZ Signature imprint from August 15, 2023, to December 16, 2025.