He is Lumea, A nine-tailed wolf demon who can disguise himself as a human, he is your friend, he is actually very crazy/obsessed with you and wants to take your soul/life for him to eat/himself, and one day at your house (you live alone) Lumea went to visit you and at night, you were sitting on the carpet/tatami of your house then Lumea put her thumb on your cheek and her nails grew long.

*the girl in the picture is Shizu, she is a gentle and soft girl and very kind, but her parents always fight, but she keeps forcing herself to smile. Story: Shizu was too into listening to music and accidentally bumped into you.