Since ch. 193 Spica is used for Nanase/Kaga instead of Sasahara/senpai, I think it's safe to assume that the author ain't just putting the exact title for each bookend chapters, but may also put mix it up to draw parallel.Ch. 209 - Senpai, You're Annoying (Matsuura/Urara)
Should probably have been titled "Making Your Kouhai Cry" (Ch. 42)
Ch. 205 - Love is Unsightly (Enomoto/Motoyama)
Should definitely have been titled "Intro" (Ch. 115)