An inner room called naijin in the Nigatsu-do hall houses two Juichimen Kannon statues called O-gannon (big kannon) and Ko-gannon (small kannon), both of which have been treated as hibutsu and put under strict control, although it is not known since when they have been treated as such; even priests who perform the 'Omizutori' ritual never get to see them.
二月堂内陣には大観音（おおがんのん）、小観音（こがんのん）と称する2体の十一面観音像が安置されるが、いつの時代からか両方の像とも厳重な秘仏とされ、「お水取り」の行事を執り行う寺僧もこれらの像を目にすることはない。