From Bible Black Wiki

Utsuno is a male Academy student and unseen character mentioned in the Bible Black: Origins series. He participates in history class.

While student Hiroko Takashiro is laying tarot cards for her friends Rie and Saki, she shows them the Wheel of Fortune card, indicating that A great change is upon you. Something will change your life completely. Saki speculates that she might find a boyfriend and that she should ask out Utsuno, despite Takashiro telling the girls the prediction might not be about boyfriends at all.