Tookago Kokuhaku Suru Menhera Gyaru
Note: If you have not done so yet, read the prequel first (under "Related" tab), as this whole thing is a spoiler for the end of the prequel. This is Chapter 20 of Toukago ni Menhera ni Naru Gyaru (Gyaru Who Becomes Menhera After 10 Days), depicting only Day 10 of the Menhera Gyaru's "Confess in 10 Days" arc.