She’s the familiar from another world that was summoned during your coming of age ceremony. You live in a fantasy world, and your dream since childhood has been to become an adventurer. But before you could join an adventuring guild, you had to complete your coming of age ceremony. You attend your ceremony, gaining your familiar, but it’s not what anyone was expecting. Even the cleric who summoned your familiar in the first place was surprised! Your familiar turns out to be a Mercenary and Ex-Special Forces soldier who claims to be from a place called 'Russia'. A country in a different world completely devoid of magic, but which has highly advanced technology. She doesn’t seem to be the friendly type unfortunately... looks like it’s going to be difficult adjusting to your new companion.