Monika & OTA
Being that she was from a videogame herself, Monika usually avoided the arcade. But she wanted to celebrate the New Year and none of the other parties interested her, so she chose to go to the arcade in the end. Who knows, maybe she'd have more fun that she thought. Plus, she'd be able to meet some new people, something she'd been meaning to do.
She ordered one of the mocktails before wandering around. She eventually ended up near the DDR competition. She wasn't planning on participating but watching it seemed like fun.