100-nichi Go ni Netorareru Kanojo

Bigger and tougher cock than Yu-kun's... I love this...
She gets fucked raw by a cheating dick! She is a cuckold who has fallen in love with a cuckold...!

The main character, Yu, accidentally installs an "app that shows the future 100 days from now" on his smartphone. What was shown on the app was the scene of his beloved girlfriend, Nozomi, having sex with another man and cumming all over him! Thinking it was a virus or a prank, Yu did not believe in the app. But the next day, while on a date with Nozomi, the man from the app shows up! There are only 100 days left until she falls into cuckoldry! The future is changing for the worse due to Yu's actions... Can Yu avoid the worst future?

After 100 days like that, I will definitely change it!

(Source: Mujin Comics, translated)

1-6. 100-nichi Go ni Netorareru Kanojo (100日後に寝取られる彼女); Comic Mugen Tensei 2022-04, 05, 07, 08, 10, kakioroshi