The Last First Love Begins with a Bet..

"I could never be the heroine, and there's no such thing as a prince on a white horse."

It’s been a year since Nao and Satomura became a real couple. Riko, who felt like her best friend had been taken away and that she was left behind, grew more and more fed up with Sosuke, Satomura’s friend, who frequently showed up at her workplace. One day, Riko’s ex-boyfriend, who is tied to a painful trauma from her past, suddenly shows up...

(Source: Micro Magazine, translated)