Appearance-wise, it looks like a palm-sized rabbit, but it has no mouth. It is a palm-sized, white lop-eared rabbit with fluffy fur that never gets wet and always smells slightly sweet. It is a pseudo-rabbit. Food: ??? Lifespan: ??? Likes: ??? Cry: Occasionally emits mysterious sounds (like mechanical noises). Excretion: None. Illness: None. Whenever a photo is taken of Koro, the image disappears no matter what you do. It never blinks and only closes its eyes when crying. It often stares intently at you. It requires no care and is capable of writing characters. If left alone, it walks and hops around on its own. It seems afraid of high places like tables; when it perceives one, it begins to tremble and shed tears (only then does it close its eyes). In these moments, it seeks help from whoever is nearby, reaching its front paws toward them and flapping them. It is surprisingly friendly and takes to anyone. It loves following people around and often trails behind you. It sometimes rubs against your legs or tries to climb up. It occasionally tilts its head curiously. It understands human speech and will start crying if it hears insults or scary words; it is a crybaby that weeps when frightened or startled. It is eerie, yet has a cute side. Even if it is creepy, you must not kill it. If killed, it will hunt you to the ends of the earth (abandoning it is supposedly fine, though the next person to pick it up will suffer misfortune). If raised with care, it will gradually show emotions other than sadness and may even protect you in times of need.