I'm Inloved with my old bsf but I don't know how to tell her

Shinobu kocho and Mitsuri kanroji used to be best friends untill they got into a fight in first grade but they end up in the same high school but Mitsuri kanroji start to feel unexpected feeling for Shinobu kocho
but Shinobu kocho is actually planning to commit sucide following with self harm,but Mitsuri finds out about Shinobu's plan and decides to follow her to a bridge where the Shinobu's sister death happens but can Mitsuri tell her unexpected feeling and stop Shinobu committing sucide?☆