A doujin cosplayer active in the scene, "Riho" is hugely popular for the gap between her childlike face and her bountiful, beautiful big breasts. However, since she basically doesn't allow anything erotic, fans have been taking photos while feeling frustrated. Then one day, while she was shooting at her usual private photo session, some out-of-control fans secretly slipped her an aphrodisiac without her noticing. It turns out that aphrodisiac was a professional-grade one used even on AV filming sets. The fans are overjoyed when Riho shows them an ahegao face she would never normally make, or strikes slightly lewd poses. Getting carried away, they repeatedly administer a super-concentrated aphrodisiac that makes one hypersensitive and aroused with just a single drop. It escalates to the point where even her normal expression becomes an ahegao face, and her ego completely blows away as she reaches climax over and over in lewd, slutty sex. So much so that she can never go back to being a normal cosplayer... #YoroP