Hmmm! I think The second row of page 18 is not involved with Hisami, I have completed and saw both of the endings but the CGs are still hidden =((((
Viewing post in Version 1.14 and Future Update Schedule comments
The second row of page 18 are the cgs for the last date with Oki (steamy garage scene) and the last two are the cgs you unlock watching Hisami prequel story after you unlock it on a new game.
I'm currently missing the last two cgs of the third row of page 18 and the entire page 19, if anyone knows how to unlock the encounter with Dr.Ken it would be major because I'm sure I'm missing his cg