Endroll no Ato ni wa Saikou no Tabi wo

Aino the Hero and Iro the Mage.
After defeating the Demon King, the two women embark on a journey around the world to fulfill a promise they made long ago. This is their story after the end credits roll—the greatest adventure dedicated to each other. A heartrending, radiant road trip fantasy.
(Source: Manga UP! Global)