
Spoilers for ch 13 below, I tried to keep it pretty vague though
Apparently it's really unclear lol. I've seen other people discuss it and they've said that their gender has never been explicitly stated anywhere, except for Minato when he was talking about Onodera to Itsuki in ch 13. He only saw Onodera from a distance though so it's debatable if he's just going off of an assumption or not. I've seen a lot of people say that they think Onodera's a guy or a transgender woman but as far as I know, nothing's been confirmed.
There's a really interesting post that goes into more details here if you're interested in reading more on it! https://amaya-chwan.tumblr.com/post/651345401399640064/therapy-game-restart-discussion-who-is-onodera
Am I the only one who has a bad feeling over the woman(director?) who never shows up and is on a vacation... hope she doesn't become the annoying female sc in every bl