It's a story about a female high school student who traveled through time. A young prince with a fair face and red lips saved her (because he thought she was a strange person when he saw her wearing a high school uniform), so people in ancient times are really ignorant. But everything about the palace in the future was caused by the fact that a female high school student brought a ballpoint pen and went to a pawn shop and bumped into the young prince when she went out, so this is the name.