It has been bothering me for a long time as well. It should be an issue with the game version. The original Japanese version allows access to all CGs, and I have a saved file here. https://1drv.ms/u/s!ArLEAHnvHnEucT7pDgKyJ0VlobU?e=EHRJN7
heyy can you please update [210811][ナッツが主食] JKボクサー凛香と復讐の地下リング Ver1.1 [RJ325990], there is a newer version of the game, it gives the game an english translation, thank you