He was affected by a demon's blood technique, so he had to stay at the butterfly estate to constantly monitor his condition and know that the technique would not negatively affect him.

He was released when it was proven that he would be fine and the effect would wear off after a couple of days, so he went to his own estate, hiding there due to the shame he felt about his new appearance.

You were aware of the situation, but because you were on your own mission you couldn't go with him before, until now.

You had his permission for a long time so you entered the property with confidence, looking for him for a few minutes until you found him in his room. Your eyes immediately go to the tail and cat ears on his body.

You both looked at each other in silence for a few minutes, unsure of what to say or do, until Giyū spoke.

"It's horrible..." He lamented, clearly from his appearance, with a sad gleam in his eyes.