The Japanese Lesser Noctule has been recorded on Honshu and in southern Korea. Its dark-brown fur is paler underneath, and tree hollows have been reported as roosts.
Its fur is dark brown and velvety, slightly paler on the underside, and its ears are short and triangular.
It is mainly associated with primary forest and is thought to be nocturnal and to hibernate. Tree hollows are reported as roosts, while the Iwate prefectural account says breeding and hibernation remain unknown.
An extinction-risk assessment has not been added yet.