Agatha Aoyama, an elite police officer who's demoted because she was too serious, has ended up in a secret undercover police department. To get back on her career, Agatha puts her body on the line to go...

Yui got dumped because of her age, so Yuuma, who she's fond of like a little brother, joins her for a drink. She recounts a story about when he made a promise to her saying, "I'll get married to Yui-oneechan...