Yukifuru Mori no Mamoribito

Kiro travels to a snow-covered sacred mountain to take part in a ritual that welcomes the arrival of spring. According to legend, "the guardian of the holy peaks" protects this sacred land. However, Kiro loses his way in the mountains and collapses in a fierce blizzard, prepared to meet his end. But when he regains consciousness, he finds himself in the arms of Jin, a mysterious young man who lives alone in the snowy mountains. Until his injuries heal, Kiro stays under Jin’s care... but what awaits him in this secluded, mystical place?

(Source: Tokuma Shoten, translated)

Note: Includes one extra chapter.