A Certain Pub's Sequel (とある酒場の後日談), is a special story included in the DanMachi Volume 5 limited edition booklet.
Once Ryuu returned from the 18th floor to save Bell's party, she returned to the Hostess of Fertility. Preparing the pub while talking with Lunoire and Anya, Ryuu felt apologetic for troubling her coworkers and Mia.
Still, when Ryuu returned and reported Bell's safety to Syr, Ryuu felt satisfied with her work thanks to Syr's overjoyed reaction. Suddenly, Chloe appeared, smirking. She teased Ryuu about if Ryuu had her relationship with Bell progress.
When Chloe, with a vulgar grin, mentioned Bell seeing her naked, Ryuu turned in shock and embarrassment at how Chloe knew. Seeing how Ryuu reacted confirmed the shocking truth to Lunoire, Chloe, and Anya, leaving them speechless. Ryuu realized what she had just revealed, and the others screamed as they noticed something. Syr's voice rang out, as she came out of the kitchen with Bell's lunch, inquiring about what she had just heard, a smile on her face.
Ryuu was pressured and paralyzed by that smile, as a coworker announced that Bell was coming. By the time Ryuu could frantically try to explain what happened, Syr had already met Bell outside, his scream soon ringing out.