My feelings while reading this chap: KOYORI!!! DO SOMETHING!! SHOUT ENCOURAGEMENT OR SOMETHIN" KOYORI I ALSO LOVE YOU... then I realize that Koyori, when she's that serious, won't need words to convey her feelings. She did place her power in that bracelet and her feelings reached Agari.
My favorite though, gotta admit Koyori saying with full confidence "I'm better than her." Got my heart thumping...