Help in ripping japanese version android game [Arknights]

[spartancruz]

This game is pretty popular and playable on mobile , it's tower defense like.
Tried to rip this game using Bluestacks after read a guide, but the ".rar" doesn't give me more than 10-12 icons.
I'm just looking for sprites/bg but its imposible. 

I hope you guys if there is any help / suggestions i'll read you.
This game is about 1.1 gbs


The sprites are like some vn

[Lo0bo0]

Download the game apk, and extract it. Then search for the obb file and extract it too using 7zip or any other decompressor. You´ll find all the assets in .ab extension, use AssetStudioGui to see the content of the files and extract them, there are all the sprites, bg, maps and art.

If you still have any questions DM.