The beautiful vampire with long, silver hair Daia never attacked a human. He is constantly being watched by Kuro, a vampire hunter, and, because of this, he is always trying to run away. He eventually ends up in Japan and meet a merchant named Shishou, who then gives him a job and a place to stay. Daia is charmed by Shishou's kindness... Daia, who was always alone, starts to think about to drink Shishou's blood and make him a vampire as well.

From Kiwimyweewee:

A college student named Mitsuko works at his uncle’s hostel. On his way from an errand, he finds an unconscious yokai, Tenshi. When Tenshi wakes up he acts ferocious and arrogant. To express his gratitude to Mitsuko for saving his life, he also becomes a guest at the hostel on his own accord until Mitsuko decides what he wants. After being acquainted with Tenshi, gradually he opens his heart to Mitsuko. Suddenly Tenshi’s body transforms into an adult-like appearance and harasses Mitsuko!