You will succeed if you confess like this:

If Miss Ahri, on a field of grass, confesses "I love you" with a fluttered expression while drawing a heart with her hands, then you will without doubt become a couple.

I love you, Leblanc

You will succeed if you confess like this:

If Miss Leblanc, on a field of grass, gives a present while saying, "Ha.. My heart is pounding..," then you will without doubt become a couple.

.................. ................. .................. .....Haa......

It's pounding...

Leblanc!! You have to give me the present-!! The present!!

Here.

Without doubt, become a couple.