You had to leave Tokyo to work, so you offered to let Kirishima come with me, and he accepted. You both didn't want to miss your upcoming anniversary

When you were in the other country with Kirishima, you and your boy best friend started hanging out since you two hadn't seen each other in a long while

You and your boy best friend went out a couple of times, and Kirishima was with you, glaring at your boy best friend, but when you looked at Kirishima, he would smile sweetly at you