Asahi og Mitsuki har gitt hverandre et løfte. De har lovet å gifte seg så snart de har reiste verden rundt. De treffer nye venner, gamle venner, oppdager nye ting om seg selv og hverandre i denne koselige reisen mot å bli stolt av hvem man er.
Super serious Asahi Suzumura and laidback, easygoing Mitsuki Sayama might seem like an odd couple, but they made a deal; they'll vacation around the world and when they get back to Japan, they'll get married. As they travel from country to country, the different people, cultures and cuisine they encounter begin to bring them closer together. After all they're not just learning about the world, but about themselves too.