Biwa-bokuboku

Origin
The Biwa-bokuboku is a yōkai from Japanese folklore. It was described by Toriyama Sekien as an anthropomorphic being with the head of a traditional biwa lute. The Biwa-bokuboku comes to life at night and sits calmly in a tatami room, singing and plinking while lamenting the neglect of his former owner. Other stories report of Biwa-bokuboku dancing through inhabited houses while making lots of noise.

Effects
Only activates in the presence of someone who has suffered loss and only if they are alone. Its effects vary depending on the involvement the person had in the inciting incident.

If they are the victim, losing either significant material possessions or a significant relationship, the artifact will play gentle and simple tunes to help soothe them. If, however, they are in proximity to the one responsible for causing the loss such as an ex-lover, the artifact will play loudly and disruptively during the night to cause them distress.

This artifact is considered well-meaning and particularly benevolent among the more chaotic tsukumogami and was retrieved with little incident from the home of a noble Japanese family.