Typical Japanese style anime art, it was a series.
It has been around for more than 6 years.
I think it mixed fantasy and sci-fi. It was certainly not Isekai and it has no magic, it feels more like revered science.
A boy gets a gem embedded into his arm after a terrorist attack and transforms into a white and orange humanoid being.
There are more people able to transform into these beings.
There is also a red flying ship with a dark yellow underbelly that throws boxes with parachutes.
There is also this top-secret laboratory where the scientists study how to battle against the beings.
There are some other flying ships of varying colors.
If I remember correctly, the protagonist gets amnesia near the end of the plot.