At that time, a son of King Uija, Prince Hosho FUYO (Pungjang BUYEO) had been in Yamato (Japan) as a hostage for the alliance between Kudara (Baekje) and Yamato; Fukushin KISHITSU and other surviving retainers asked Yamato to send Hosho back as a symbol of the re-establishment of Baekje and to provide military supports.
この頃、義慈王の王子であった扶余豊璋は、倭国との同盟の人質として倭国に滞留していたが、鬼室福信ら遺臣は、百済復興の旗印として擁するため豊璋の帰国と、倭国の軍事支援を求める。