Nishinomiya Shrine is just outside the grounds of the Oasahiko Shrine near Bando in Tokushima, and is a massha of that shrine.
The kami enshrined is Amaterasu, and my guess is this shrine was created in the Meiji era as that is when many shrines to Amaterasu were created as part of State Shinto.
Amaterasu is often referred to as the highest of the kami, but that is more an ideological viewpoint rather than historical fact.
The two small komainu were very unusual....