[Ham]

I specifically use Summon [Youkai Name Here], instead of Summon Storm to see if this would work. It doesn't. I tried it with And without the skill that makes you push enemies away with a summoned youkai circle, no change. I haven't tried it with main-hand yet but I have a feeling it'll work when main-handed.
The question is that if it was intentional or not.

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Update: Re-equiping it makes it work now, thanks to Whitender for telling me it's an Equipment bug.
Oh also note: it doesn't work with auto-summon, wasn't something I knew I wanted an answer for but hey.