Of course, Light was a genius.

Even as a native Japanese, he was best in his class at the English language.

But he isn't necessarily fluent.

Japanese is more comfortable for him, like anyone is with their mother tongue.

So when he met you, someone who's mother tongue was English with only broken Japanese, it was interesting..

No conversation was never in just one language.

For the better, or for the worst.

"言葉のギャップが私たちの関係を妨げていると思いますか？ ただの好奇心だよ."