月が導く異世界道中 第二幕【Moonlit Fantasy】||マコトとの戦いの最中、混乱したソフィアは秘密兵器を解放する||Tsukimichi Moonlit Fantasy 2024 

It's luto actually he watching them from start so yeah he also gave some powers to hibiki

It was Mitsurugi who was the partner of Sofia. They agreed if he would die he would become a sword which Sofia could use with his left power.

@@gergelykiss8886 I see.. Kuzunoha saying "probably a hero turned into that sword" messed with my mind

I think it's the another otherworlder that's why it's a Japanese sword. When Mitsurigi die all his power will be transferred to Sofia and his remaining life that's why Sofia can use Mitsurigi powers.Mitsurigi has two life and he was a expirement that root created.