Banished from the Hero's Party, I Decided to Live a Quiet Life in the Countryside, Vol. 4 (manga)

After getting through Dir's attempt to ruin their lives unscathed, Red and Rit decide to play hooky from their shop and take a trip to the river for a well-deserved, much-needed date. After an energizing time in the sun, they're ready to go back to peace and quiet, but things are rarely that simple-when an injured man stumbles into Red's shop, the couple is forced to spring into action.