Slow Damage Missing CGs

While playing the game I just finished Rei route and realized I'm missing three CGs which should be on gallery since I completed that part, which is from Ikuina's route Madness and Euphoria. Does anyone know how to fix this?

Missing two backgrounds from his house and one where he is smiling with Towa

https://i.imgur.com/ocsu3tJ.png

https://i.imgur.com/O22M5XM.png
https://i.imgur.com/dZXQfB0.png

If you haven't completed all routes of the game, then you won't be getting those CGs just yet; there's a reason for this, but saying anymore would be massive spoilers.