Toko-chan's childhood friend (and best friend in the world) is Abe Maria-kun, a purebred vampire.
Manshinsoui no Futari
A short high school romance about a boy who is suffering mentally and an extremely clumsy girl. (Source: Omari's Sister)

In a world of never ending winter, orphaned and banished Tete finds herself in the company of the very winter monster who killed her parents and who continues to ravage the land. It's a beautiful and bittersweet story of hope and redemption.
Source: mangaupdates