Well, we may say "また、よろしくね！", which means "Let’s stay in touch, hereafter!".
But I think we can also say "ねえ、連絡先聞いていい？" which means"How can l contact with you?".
I don't say"友達になろうよ"（I wanna be your friend") 'cause that phrase must make the unclosed friend speechless (^^;)
Perhaps, this may be enough "またね!", which meas "See U again!"
But I think we can also say "ねえ、連絡先聞いていい？" which means"How can l contact with you?".
I don't say"友達になろうよ"（I wanna be your friend") 'cause that phrase must make the unclosed friend speechless (^^;)
Perhaps, this may be enough "またね!", which meas "See U again!"