Yuuka is happy someone picked a flower? This manga is just too weird.
I might be mistaken, but in canon she doesn't get mad if you pick flowers to make a bouquet either.
I was right, leaving it to Yuuka...!Uhmhmn... Thank you.What a darling little flower.This... for me?Hm?Ah! No fair, she's gone ahead of us!!Erm...This...That's not exactly a flower...Just you wait, I'm good at finding four leaf clovers!!
