Oh for... how much of a namby-pamby pushover can Koiko be? Afraid that a smaller, younger girl will kill her, and begging for her life... I feel like yelling to her: "You're the sempai, dammit, show some guts!"
Small mistake in page 126 last panel: it says, 'since my friend K couldn't be honest about her feelings, she ended up alone' but it should say 'my friend N' because it's about Nika not Koiko.