How… reassuring. Well, he’s already made peace with he’s going to be meeting someone who’s to become his ‘rival’, and nothing more he REFUSES to believe this is some fated boyfriend situation that’s incredibly stupid, but he nods regardless.

And oh boy Kira’s taunt works. He’s aware he’s probably being goaded, but screw it he’s a competitive little shit! He gives a competitive smirk as he accepts the darts.
“Of course, of course” he keeps his tone pleasant but the slight twitch in his smile means he acknowledged the jab. ‘go easy on me’ he says, like Kira isn’t the one with objectively more time to practice between the two. But akechi will give it his all. Maybe he can surprise the time traveler yet!
Which is an objectively ridiculous sentence he thinks but screw it better to just roll with the weirdness in this place.
Akechi steps up to the line and readies his aim.
And of course, he hits the bullseye on all his throws. Not perfect shots, mind you, but he’s consistent and that’s what matters to him. After his turn he looks to Kira and smirks.
“Don’t hold back on my account.” He says with a overly sweet cadence that makes it pretty clear he’s exaggerating. But the meaning is there, he will be insulted if Kira tries to ‘let akechi win’ he wants to see just how skilled this time traveler is.
And maybe it’s because he’s competitive more than curious but seriously if he wins it wants to be because he genuinely won, not because this guy was handicapping himself.
That also means the possibility of loosing but he can put up a fight.