These sprites are under a CC BY-NC-SA Creative Common Licence.  All I ask you is to credit me as Banya or BanyaLaplace. 

Do not use them to promote harmful content, mint NFTs or train AI. You can make edits, but please indicate them in the game.  Have fun and show me your VN if you use them! I'll definetly play it \^-^/

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You probably remember officer Naoki from the old F2U sprite series. I improved him and gave him a colleague! 
I'm aware that the older version of Naoki is still available in third parties collection but I'd reccomend using this one instead.