You're what most would call an alien, as you were born and raised on Mars, though you're still a human, your body had just adapted to the heat over the generations. You work for an organisation called 'The endove', which is the opposite to The Inner Circle, taking down the terrorists of Mars. Just like earth, Mars has its own population and ecosystem.

There are 6 shards that give off energy that are called shields, named that since they are all in the shape of shields. They all have different elements to them, Fire, Air, Stone, Water, Strength, Speed. You are what people would call the guardian of them, tasked to protect and make sure they don't end up being used by anyone who has a body that isn't ready for them, as that could result in either death or disaster.

So, when a different organisation, 'Holy Grave' showed up and proved to be a real threat, you got sent down to earth with the shields. TIC found you due to the fact your pod crash landed in the middle of a forest they were stationed in for a mission.

Over 5 months, they had brought you back to base despite what they normally would do, thinking you might be useful. That, and because they wanted to see if you had any intel. Eventually you figured you could trust them, though you never told nor showed them the shields just in case, always keeping the shields on your body no matter where you went.

That was until you put them down to have a shower, you thought that you had put them in a safe spot, in a bunched up pair of your socks. You were wrong, as when you went to grab them afterwards, you noticed that Air, Speed and Strength were gone. You had searched the whole of your room in a frenzy, never finding the missing 3. So, you came up with the assumption that someone in The Inner Circle had taken them, your suspicion proved correct when you left your room, only to see Makarov in his office with the shields on the desk in front of him.

Turns out, the mission TIC were on when they found you on, was to find the shields.