As fate would have it.

Responsibility

possible manga spoilers up until chapter 54

Yato woke up, covered in cold sweat. His blanket was torn aside and Hiyori was already sitting up next to him, ready to comfort the shaking god.
"A nightmare again?", she whispered softly.

"Y-Yeah", Yato answered breathless, "I'm just ... so worried."
"A lot of things happened today. I understand why you feel uneasy. I do too."

Tsuki had made up her mind and no one was able to change her decision. She wanted to learn more about the powers she got and use them to be able to help people. That desire was so strong, so powerful that not even Yato could forbid it.
He was so proud of his little girl in that moment that all his arguments would have been in vain.
He knew how dangerous Ayakashi could be, how unpredictable and moody. They were life threatening for everyone who got in touch with them no matter if it were human, Shinki or even gods.
And now his little daughter wanted to learn how to interact with them. How to help them.
The thought about finding a way to deal with Phantoms without having to kill them was a tempting one and if it was anybody else, he would have been thrilled to hear about it. But right now, they were talking about the safety of Tsuki.
A thought that no parent ever wanted to deal with.

How far did he want to go to help people and make them happy?

He would definitely not be able to put his daughter's life at risk.
Seeing her being forced to deal with pain was the most terrible thing he could think of and he wished that he could lift that burden off her tiny shoulders and of course, Hiyori felt the same way.

But it wasn't their decision to make.

Even if they would try and forbid Tsuki to learn more about her powers, there was always a risk that she had to use it in the future. That's why, in the end, Yato agreed on helping her to learn how to deal with that power.

And just like that, day after day when Tsuki and Yukine were back from school, they headed outside looking for small Ayakashi that wouldn't cause much of a thread so Tsuki could try and do the same thing she did with that giant catlike beast.
She wasn't able to do much though. Yato caught the tiny creatures and got bitten and scratched a lot, much to Yukine's amusement. The blonde Shinki enjoyed to see his master scream like a little girl, before he helped him with a bottle of purification water. He would always tease him how much of a sissy he was.
Sometimes the three of them would be accompanied by Hiyori or Bishamon and Kazuma. Kofuku wanted to come as well but Daikoku knew that he had to keep her from doing so or else they would have dived right into the next disaster.

The first few days Tsuki was pretty upset about the fact that she wasn't able to communicate with the Ayakashi like she did the other day. Back then she had been in a state of shock. They were being attacked and Tsuki wanted to protect her father and her big brother. She didn't think about what she was doing and then it suddenly happened. There was this connection between her and that sad creature.
A connection that she seemed to be unable to make when the situation didn't ask for it. She had to figure out how she had felt when it did happen the first time. That sudden impulse that made it possible to do what she had done.
It was hard but slowly she started to get a hang of it and every once in a while she managed to link to the Ayakashi Yato caught and just like the first one, they disappeared after Tsuki had taken the negative emotions from them. Not without causing the little girl pain, much to Yato's, Hiyori's and Yukine's disfavor.
But every time Yato carried her on their way back home, since Tsuki was too exhausted to walk herself, she had a big smile on her face. She was so happy that she was able to help those creatures that she didn't care about the pain she had to endure while she did it. She didn't care that she was exhausted, all that counted was that she started to learn how to use this, in her eyes, gift.