When an overworked office worker wakes up, she finds herself in the world of her favorite otome game, “Falling Stars: Astrolabe of Love.” And what’s more, she’s reincarnated as Diana, the villainess! On top of that, Prince Sirius, the character she’s trying to win over, approaches Diana, the villainess, not Chris, the game’s heroine...!

When the villainess and Sirius get together, there will be a Bad End. Diana, who knows the truth about the game, struggles to keep Sirius away from her. However, Sirius refuses to give up. Diana has no choice but to try to force Sirius and Chris together.

Diana has been hit by Sirius's passionate feelings. But, despite her mixed feelings, Sirius still makes her heart race. So then, to find out why the prince is in love with the villainess, she visits a place they seem to have shared a significant memory.