The anime DVD was originally adapting the Earth arc, the arc that began with the manga’s 18th volume.
The 21st volume will ship in Japan on August 17 with an anime DVD.
This year’s 31st issue of Shueisha’s Weekly Young Jump magazine announced on Thursday that the 22nd compiled book volume of Yū Sasuga and Kenichi Tachibana’s Terra Formars manga will bundle an anime DVD.
The manga also inspired a two-episode OVA series that adapted the manga’s Bugs 2 arc in 2014.