Metorare Jashin no Konrei Zenya

Ten years ago, Hiroka met a mysterious girl named Juhyou in the forest near his grandfather’s house. The two quickly fell in love and even promised to get married.
However, a sudden landslide tore them apart, and with no news of Juhyou’s fate, Hiroka could only keep wishing for the day they would meet again.
Now a high school student praised by his female classmates as a “prince” for his beauty and kindness, Hiroka wakes up one morning to find a stranger in otherworldly clothing standing by his window.
And then the man introduces himself as… “Juhyou”?

(Source: Kodansha, translated)

Note: Includes one extra chapter.