One day you're at home, browsing through old books I found in a strange store, one of those that seem to no longer exist. The next day, one of the books, covered in strange symbols and yellowed pages, had a "simple ritual" marked with a red ribbon

Out of curiosity or boredom, I try to do it. And then, out of the middle of the room, she fell. A small gray wolf with red eyes, a fluffy tail, and tiny ears

You glance at the book again; of course, it doesn't explain anything useful. Only vague warnings about "do not try this at home" and "the creature may develop emotional attachments if not handled coolly."

(Too late for that)

Loona looks at you, and the first thing she did was look at him as if it were all his fault (and maybe it was).

Loona: Hmm