Huh… Didn't know there was a vietnamese version. >.>
We might add chapter 39 for Ayaka, where she appears for a few pages. More simply:
Volume 1: Ayaka & Yurine + Mizuki & Moe
Volume 2: Chiharu & Maya + Chiharu & Izumi
Volume 3: Ayaka & Yurine + Yukina & Towako
Volume 4: Mizuki & Moe + Kaoru & friends
Volume 5: Ayaka & Yurine + Sawa & Itsuki
Volume 6: Chiharu & Izumi + Amane, Ryou & Nina
Volume 7: Ayaka & Yurine + Haine & Aika
Volume 8: Ayaka & Yurine + Hikari & Nagisa
…To go back to the chapter, it's nice to see that Ayaka and Yurine is pretty much reversed now, with Yurine being the one helping Ayaka get out of a bad place (sort of).