It is found in natural caves and rock crevices, as well as man-made structures (Krivosheev 1984, Sano 2015). In Japan, adults and sub-adults of both sexes form maternity colonies of tens to hundreds of bats. Often forms clusters consisting of different bat species.

Parturition occurs during June to July. Females produce a single infant per litter. Most females produce their first infant at the end of their second year, pregnancy rates in adult females are extremely high, some females breed up to 15 years of age. Copulation occurs in autumn, but reproductive ecology during the mating season is unknown. Reproductive pattern involves seasonal monoestry and delayed fertilization (Sano 2015).

The species flies above water surface and preys on insects and other invertebrates in flight or catching from water surface. As an insectivorous bat, it plays certain role as a natural controller of agricultural and forestry pests.

This species is known from the Russian Far East (southern Primoriye, northward to ca. 45°), Kunashir Island, NE China, the Korean Peninsula (including Jeju Island), and Japan. In Japan, it is known from Honshu, Shikoku, Kyushu, Hokkaido, islands of Sado, Tsushima, Oki, Iki, Fukue, Tane-gashima, Amami-ohshima and Tokunoshima (Sano 2015).

In China, it is listed as Near Threatened (NT) (Jiang et al. 2016). It is not listed in Red Data Book of Russian Federation, but considered in Red Lists of both Russian regions where this bat exists.