Yume no Tochuu de

Udai Daikoku, a hot springs enthusiast, admires an anonymous hot springs reviewer referred to as "Iyashinbou" and uses his reviews as a guide to visit obscure hot springs in mountain villages. Udai has dreamed of bumping into him at a hot spring someday, and that day has finally come. This is the story of the mysterious master and disciple's journey to visit hidden hot springs.

(Source: Natalie, translated)