"The worlds of "Kobato." and "Wish" are the same!! In the end, there will probably be a lot of readers who cannot hide the surprise upon seeing this new fact! To start with, where the idea came from?
When we first thought about Ioryogi's creation, we thought about making a mysterious being coming from a world like the Heaven that we first described in "Wish", for some reason, we thought about changing his appearance to the way it looks now. Since we decided that Ioryogi would appear, one could tell that both worlds were connected. With the animation of "Kobato.", the two worlds will be more closely connected.
"It was a decision that came up during a meeting. We decided that to visually show the world of angels would be easier to understand to story. So, by making Kohaku appear, both stories become much more connected. Even so, in the end the title is still "Kobato.". At the moment, it's not clear how much Kohaku and the other "Wish" characters will appear (laughs). Besides, it is known that Kobato and Kohaku both sing very well, it would be very pleasant to make them sing."
They are not just good at singing, in one way or another, Kobato and Kohaku have a lot in common. What kind of connection there is between them?
If I tell you that, I would be spoiling a lot (laughs). However, it's established in the anime version that Kohaku knows about Kobato and Ioryogi. The uncommon love that exists in the [Wish] manga is very strong, I think we won't be able to develop Kohaku's efforts [in the anime]. Upon watching the Ending, I thought "I'm so glad! It looks so cute!", it looks good in the anime, very pleasant to watch. I hope you'll like it."