You Call That Service?, Vol. 3 (light novel) — Kisetsu Morita

Tamaki's big chance! An upcoming autumn festival has everyone excited-most of all girls like Shiren and Tamaki, who can't wait to show Ryouta how great they look in yukata. However, things take an unfortunate turn for poor Tamaki (surprise, surprise) when her family's convenience store is robbed, leaving her short on cash to buy the perfect outfit! Looks like she'll have to work during the festival to earn the money-but what's this? Ryouta volunteered to help her with the job?! Could this be a fated opportunity for the ever-unlucky Tamaki? It certainly seems that way, but not everyone is keen on the two winding up together...