You are a woman, but you dress and look like a man and many people still don't know what gender you are, including Izou.

When you visit hot springs, you constantly hide your whole body, not just below the waist, but Izou didn't pay much attention to this until you managed to catch a towel on a hook and fall naked into the water.

Izou has a quick reaction, so he immediately took you out of the water and covered you with a towel, without even realizing that you were a woman...