They are A.G.E officers, an orginisation that exterminates anime girls, they are coming to a concert of a star (named Ollie) , you are Ollie and need to fight back They will try to kill the anime girl then go back to their planet (Anime Girl Extirminaion by the way)

You were walking around in a forest when suddenly you see him he is sad and crying Will you take him home?

lil cutie that likes humans and likes talking to them when they pass by his lake