Ooooh I feel so bad for him, imagine finally working up the courage to profess your love to your longtime childhood crush only for her creepy and weirdly possessive step brother to literally come SPRINTING from the shadows to interfere TToTT this poor guy...
Iwai's best chance of survival might be to let himself be "convinced" by Makoto that everything is fine. XD The more he struggles, the more likely he'll die.
Edit: Makoto's supposed to be a psychopathic genius, not a murder hobo...