I asked my friend for more background info, because the promotional material kept stressing Usagi has an accent. I didn't know why that is important for our MC.... Turns out, the dude ain't weak. He is in uncharted territory and getting wrecked.
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Keep in mind all of that is happening so fast while she is physically and energetically overwhelming him while having twice his presence and size. By the time he gets what's going on, she's already laid on several attacks.
It's also important to note, that it's not uncommon for Japanese people to just freeze up in "unscripted" scenarios due to deeply ingrained cultural, linguistic, and social factors. This behavior is often not a personal failing, but rather a result of a "tight" culture that values preparation, harmony, and avoiding embarrassment.
The author really thought this through, and I would expect this manga to be even funnier from a Japanese reader's POV.
Let's see how he survives this "bunny", because at this rate... he's being hunted by a wolf.