Akizuki Kanna

A death goddess who has lived for over 100 years. She has great difficulty operating modern-day technology, instruments, and tools. Her worldly knowledge is at about the level of a grandma living in the country. Even though she's lived over a century, she's a very down-to-earth person. She's friendly, easy to get along with, and can be teasing at times. However, on rare occasion, you will see her act befitting of someone who's lived as long as she has. [Vndb.org]