@luvnanofate it's not exactly slow, it just doesn't focus on conflicts and other dramatic elements like most yuri mangas tend to do because sakurako and kasumi never fight, they're like an elderly couple from beginning to the present.
also skipping from 7 to this chapter huh, i see. if you don't know in this chapter they're already in college.
and yes it is stretching out. since the manga revolves around sakurako and kasumi's relationship, usually school romance mangas end when the main character and co graduate high school but in here the mangaka is stretching it to college and it's interesting in my opinion since not many are doing this.