Kinokoinu

Originally, Kinokoinu Mushroom Pup was a pink mushroom growing in Hotaru Yūyami's garden, but one day, it suddenly "transformed" into the form of a dog. Its body is mainly white, with the area from its left eye to the left side of its head featuring a pink background with white polka dots. The left ear resembles a mushroom cap. Kinokoinu Mushroom Pup understands human language and seems to possess the cognitive ability of a young child. It experiences joy, sadness, or anger in response to the words and actions of those around it, and sometimes behaves in an exaggerated manner when it gets emotional. Determined to deliver messages to Hotaru Yūyami, Kinokoinu Mushroom Pup desperately studied hiragana using the "Aiueo Book" found in the house and, with Yara's advice, managed to learn how to write characters. However, writing is not its strong suit. Later on, it even becomes able to send messages via cell phone. Kinokoinu Mushroom Pup eats various things but does not eat dog food. In general, it likes foods favored by children and enjoys being splashed with water. It especially loves takoyaki and has started making its own with a "chacha" sound. Occasionally, particularly after waking up, it scatters spores in the garden. Hotaru Yūyami suspects that this might be Kinokoinu Mushroom Pup's way of excreting.