He also says it is a combined present for white day and her birthday which she replies with: The truth comes out, you did this because it was a bother so better combine it.
She asks whether it’s empty.
After she opens it, she sees a heart-shaped necklace which she says is a too «heavy» gift, not something friednds give to each other. Kiyo realises that it wasn’t the best gift at all so he receiver a little shock since presents are meant to make the receiver happy.
He tells her that it costs 20k yen after she asked. He reveals that he didn’t know what to give girls so he just browsed on the net and found a shopping site selling presents to girls and since he felt white day and birthday combined should be a big gift, he decided on a pricy one.