In a society where people and youkai peacefully coexist, a 20-year-old housecat named Buchio living in the Japanese countryside is reborn as a nekomata, much to the delight of his human family. Now, Buchio sets out of a journey of self-discovery, aided by his fellow youkai neighbors. Meanwhile, one of his human family members, a girl called Mutsumi, has recently lost her father, likely to a mysterious force known as The Void. Now, her growing curiosity about her youkai friends tangles with grief over a missing family member, while the looming threat of The Void casts a palpable shadow over her otherwise quiet small-town life.