Mariko, codenamed "Rose Marie", is a division leader in the private anti terrorist group CAT (Counter Attack Terrorism).
She lost her husband and son in a terrorist bomb attack at an airport.
After suffering injuries in the blast, she was left with a scar that looked like a rose flower on her chest.
The manga follows her all-woman division's feats and challenges, both military and private, from the 1980s to the 1990s,
a time of instability and change.