This is what I played to get a kiss from her. I saw many people asked how to get it, this is why I did this guide.

When you start from the beginning just answer :

"Heck no" to Lea
"I lost mine" to Hoshi about your bra
"Help Hoshi" in classroom
"Play tennis" with Hoshi instead of go running with Selina
"Invite to Karaoke" Hoshi when she talks about it
"Sexy bra" to go to the karaoke

Now enjoy the kiss (;

Hope that it helped you guys.