Shueisha's MANGA Plus service added Tsuyoshi Takaki's Heart Gear manga on April 2, as well as Tatsuya Endō's Spy x Family manga on March 24. Both manga launched in Japan in Shueisha's Shonen Jump+ service on the same day.
Shueisha describes Heart Gear:
In a ruined world, a human girl, Lu, and a droid, Zet, 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…
Takaki launched the Black Torch manga in in Shueisha's Jump Square magazine in December 2016, and ended it in 2018. Shueisha published the fifth and final volume for the manga last August. Viz Media is publishing the manga in English, and published the third volume on February 5.
Shueisha describes Spy x Family:
The master spy codenamed has spent his days on undercover missions, all for the dream of a better world. But one day, he receives a particularly difficult new order from command. For his mission, he must form a temporary family and start a new life?! A Spy/Action/Comedy about a one-of-a-kind family!
Thanks to ravegrl for the news tip.
Sources: Manga Plus (link 2), Shonen Jump+ (link 2)