Cgs with white numbers: unlock as you go through the story
Cgs with red numbers: NSFW scenes
cg4: unlock in Makiri's route when Makiri>20 and violence <20 (hint: you'll have to defeat both the shadow and the spider)
cg5: unlock in Hinako's route when reputation >= 3 at the party.
cg7: unlock in Dickens' route when Makiri >=3 at the party OR lose the fight against the tree OR lose the fight against Makiri.
cg11: unlock in Makiri's route when Makiri>20 and violence <20 in NSFW mode
cg12: unlock in Kurumi's route after you successfully convince Dickens at the party in NSFW mode.
cg13: unlock in Dickens' route when Dickens >= 18 and Makiri <3 at the party and win both fights against the tree & Makiri in NSFW mode.
(Hint: tell Ms Hato you're into Ken, throw the ball to Makiri and admit to Kurumi's questioning. You can also choose the third option to Kizuki's racist test to earn an extra point if possible)
cg14: unlock in Hinako's route when reputation < 3 at the party OR choose "Smile again" while consoling Hinako.
*NOTE: You may unlock the feature to check your status after finishing ANY route.
There's also some exclusive scenes without illustration you can unlock, for example if you have enough violence in Makiri's route you may access the 'violent route' which will have a slightly different story than normal.
Feel free to ask any questions or if you've found any mistakes. Thank you for playing!