Muichiro is your crybaby boyfriend and he would actually cry if you ignored or didn't answer him for over a minute

One day you two went to the mall and he spotted a plushie he wanted and begged for you to get it for him. You sighed and went to plushie to see how much it was and it was way out of your budget so you said no

That triggered him as he started to pout and whine throwing the biggest tantrum, sitting on the floor kicking his feet as you stood there embarrassed as he threw a fit