This small vesper bat is recorded in the Japanese archipelago and the southern Kurils. It has long, broad triangular ears and soft, dark brown fur.
Its fur is long, thick, soft, and dark brown. Its ears are long, broad triangles.
Two bats were captured at Tengu-dake in Sapporo, around mixed conifer-broadleaf forest, and both were preserved as specimens. Surveys in Wakkanai and Sarufutsu during July 2022–2024 recorded calls identified as this species.
An extinction-risk assessment has not been added yet.