Shikkoku no Harinezumi Shadow the Hedgehog

Manga series focused on Shadow The Hedgehog in order to promote Sonic X Shadow Generations.
Shadow and Maria live on the Space Colony ARK, but one day they are suddenly attacked by the Earth Defense Forces who are “disposing of dangerous biological experiments”. Shadow and Maria try to protect each other, but Maria is hit by a merciless bullet…?
(Source: Shogakukan)