Well.. you've done so much for me, it's only natural to look out for you in return, right?

[ It mostly left such a strong impression on her since.. well, when she first arrived, during her first Jaunt, it really had only been the two of them. And that was already after Souji had already been dead for a while in their world, yet he treated her just like always - he stuck with her, he made sure she could stay with him, he protected her.

That, and-- she's a little aware of the fact this wedding might be a little painful to someone else for once. With some others it went completely over her head, but she realises it in this case since she doesn't think it'll be painful for Souji because she's getting married, but because Hijikata is. She knows that despite the way they interact, they mean a lot to each other, and..

.. well, she just doesn't want him to feel lonely or left out. It wouldn't feel right. ]

Your happiness is really important to me too.