A 1st year student at St. Claus Academy, he is the son of the gardner employed by the Saishouji family. Very innocent, Itsuki has a tendency to trust others quickly due his extreme lack of interaction with people. He's introverted and taciturn. Since he was born with a weak body, he spent most of his time around the Saishouji family garden's flowers from a very young age. Yoshitaka and Riko were the only friends he had to play with, so the three are as close as siblings. He grew up watching his father at work, so when it comes to plants, he is very bright and knowledgeable. Itsuki spends most of his time around plants, so the other students tend to see him as a gentle, yet eccentric person. [Translation of his official website profile.]