These two statues were originally enshrined with Amida (Skt. Amitābha) Triad in Umeno-dō Hall of Chūkō-ji Temple was constructed by the Emperor Goshirakawa. The statues of Amida (Skt. Amitābha), Kannon (Skt. Avalokiteśvara) and Seishi (Skt. Mahasthamaprapta) were owned by Hoan-ji Temple in Ehime Prefecture. These five statues were applied as principal images during the important ceremony (Jyōgyō zanmai) of the Tendai Pure Land Buddhism.
 
Shigeki Iwata 
Masterworks from the Nara Buddhist Sculpture Hall at the Nara National Museum. Nara National Museum, 2010, p.141, no.135. 

 These two statues are from a set of five statues consisting of Amida-nyorai (Amitābha) in the center, Kannon (Avalokiteśvara), and Seishi (Mahāsthāma-prāpta) in the front, and Jizō (Kṣitigarbha) and Ryūju (Nāgārjuna) in the back. The other three statues are kept in Hoan-ji temple in Ehime prefecture as Amida-sanzon (Amitābha Triad). According to old documents, this configuration of the five statues existed in China, too. In Japan, the same configuration of these five images was often made during the late Heian period. These five images are also depicted as the central figures of the painting "Descent of Amida and Attendants" kept in Kongōbu-ji on Mt. Kōya, the Head temple of Shingon esoteric Buddhism. However, today only one set of these five figures—two in the Nara National Museum and three in Hoan-ji temple—is extant. The Jizō-bosatsu figure makes the finger sign "Semui-in" with its right hand, whereas its left hand is shaped as if it were holding a hōju (magic jewel, missing). The Ryūju-bosatsu figure presses its hands together in prayer. Both of them are made in the method of assembling pieces of hinoki wood (Japanese cypress), and the inside of the statue is carved. The modeling of the roundish bodies and well-ordered drapes of their costumes reflect the elegant expression of the late Heian period. 
Masterpieces of Nara National Museum. Nara National Museum, 1993, p.22, no.10.