Adaptation of a manga collaboration with the Yamaha Motor Company. Included as an extra with the Blu-ray release. 
The episode was released early on YouTube for a limited time on April 29th, 2020.

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Setting up a tent, starting a fire, and eating noodles with Mt. Fuji in view...Rin and Nadeshiko absolutely love to camp! Enjoy their zest for travel and maybe even pick up a tip or two about roughing it in the great outdoors. You might just want to go camping yourself! (Source: Yen Press)

Mitsuburou no Josei