He does tense nervously at that initial question, but... when she starts to extrapolate on her suspicions, he just looks confused.
"Huh...? Why would I want to do something to The Beautiful Unit?" You can hear him saying it wrong, even though that shouldn't technically be possible.
no subject
"Huh...? Why would I want to do something to The Beautiful Unit?" You can hear him saying it wrong, even though that shouldn't technically be possible.