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to get the 100% you have to complete the entire nougat route and get all chihaya's and inori's endings, as well as do their bonus stories and complete all of the options!!

i hope u manage to 100% it!! :33

im not sure y its still locked for u, but if you completed all of chihaya's and inori's endings in the nougat route the bonus stories shud be open DD:

for the 3rd ending you have to choose; I was happy, Ask him, Accept Inori-kun's invitation, and then Stay. 

for the 4th ending you have to choose; I was happy, Say nothing, and then I want us to break up.

i hope you manage to get the endingss!!! :33

you can exceed 88% completion in the nougat route by playing through chihaya and inori's another story/bonus story. :33

i had the same issue when i played on the browser version, but after i downloaded the game it didn't glitch anymore. :3

i dont remember when i got his bonus story exactly but i remember having it unlocked after i finished all his endings, he has like 6 or 5 endings. :3