Tephra

"A three-part story: I. Yee and Gen travel to Indonesia to see a volcano, with a side-goal to revive their relationship. They quickly befriend Souma, a guide based in Indonesia for years researching on volcanoes. II. Two years ago, China. Yee met Gen at a volcano-themed event. Their similar qualities led them to fall for each another. III. After the trip to Indonesia, Yee travels to Japan to search for a blood relative and meets Souma's sister, Yui, who tells her that Souma left years ago and never returned. The two visit the volcano that Souma has been in love with since childhood…"