11-11 Memories Retold features heavy post-effects in order to conduct a distinct visual style. if you want to get rid off that effects and play with original native graphics, then follow the next steps:

1) download the archive:
2) copy the file:
3) ...into the folder (replace existing file):
4) to get post-effects back, copy the file:
5) ...into the folder (replace existing file):

• first reason is the most obvious - those post-effects are making you sick and your eyes don't like them
  
• second reason is more subtle - having default native graphics makes finding collectables easier (easier to spot them)

if you want to thank me...

...then check my guide about fixing various game issues: launching, crashing, optimization, stuttering, gamepads, etc. the guide is huge, but the topic is broad to begin with
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1935376439