It's the nineties at Tokiwaga Middle School. And for gamers like Hajime Kano, the release of Magic: The Gathering means nothing will ever be the same again!
To avoid being late for school on Vamola's first day, Momo takes the mysterious kaiju girl on a shortcut through some off-limits ruins. But the protection spell they perform doesn't work, and she runs into the slit-mouthed woman who resides there!