I believe you are looking for Seishun For-get.
"Fill my heart with joy every day. If you don't, I'll surely forget about you."
I don't remember the manga title so i'm hoping that people can help me on this, been looking for days...
On the first chapter, the Main character is hoping to have a normal high school life with a cute girlfriend, then he sees the main Heroine and ask her out instantly, and she accepts , with a condition that he makes her laugh everyday. On that condition, he agrees and start going home happily. But the next day, he comes to her and said the usual greetings as her boyfriend but she doesn't remember who he is.
Speaking of which, this is the first time i have been on this forum so if i made any mistakes, I am Very sorry :/
I believe you are looking for Seishun For-get.
"Fill my heart with joy every day. If you don't, I'll surely forget about you."
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