Kamen Rider Heisei Part 2: Ryuki

From the introduction:

There’s a noise in your ears, an obnoxious ringing that feels like it’s pressing needles against your forehead. That’s the first thing you’re aware of as you realize your surroundings - a dimly lit room, the windows and furniture covered in tarp. The moment you take a deep breath, you realize some part of you didn’t make the trip... the only object in the room that isn’t covered or hidden in a person-sized mirror. Looking inside, you see...you. You, as in, the person you became at the very start of your journey. Dressed in otherwise ordinary clothes.