Dealing with Hiretsuna

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I fielded this little bugger the other day in my first Bakemono horde and wasvery impressed.
But I do feel it's very difficult to deal with him for the opponent.
0" camo makes him near invisible and his abilites and the shadowwalk from the horde card makes him extremely mobile and easy to get in the rear of opponents and in cover.

The best options I see are models that are aware or even 6th sense, but not every list we field has those. Are those just basically manditory, not knowing what you will face?

With assasin Hiretsuna still has a very impressive damage output, especially with his ranged attack. So? What are good counters I can advice my opponent, and to be fair, I might face him myself someday in the future.

yenohoney