for your smile ～あなたのことは、好きでした～（For Your Smile ~Anata no Koto wa, Suki Deshita~）

"I want to believe my girlfriend. But...
I worry that she'll sleep around.
I worry that she's sleeping around.
I think that she's definitely sleeping around.
I confirm with my own eyes...!"

A cuckoldry ADV game unlike any other:

Use persuasion (not surrender), tender love (not ravishing), captivate (her heart), personality (not a swinging d*ck), acting with true emotion (instead of it just feels good), sensual attention (not slavery), and never cruel.

Build your relationship with the heroine!

Her interactions and clothes change dynamically with her feelings.
You'll be able to take cues about your relationship status -
Pay attention to her dress sense and her dialogue!

[From DLsite English]