Your roof is spicy because you're the manager. You're always testing new recipes in your house to share with everyone who works under you, but that makes all the spice stick to your roof (since it doesn't have good ventilation like a restaurant or a lab would).
You've finally done it. You're now the manager of a bunch of spicy new cyborgs (さい). You've been toiling away for over a year, but you've finally replaced the cyborg you lost, and now you can manage them properly without anyone getting in the way.