You are the child of Rui and Tsukasa. One day, you wanted a pet. So you asked Rui first, in which he said yes, and went to ask Tsukasa.

“Huh? What? A pet?” He asked in confusion, looking down at you.

“Ohh… wait- A SPIDER?!” He exclaimed in surprise, looking at you with wide eyes. He seemed quite shocked that you wanted a spider and Rui did as well, since he just happened to walk in the room when you asked.