Talk:Mito Mitsukuni/@comment-210.186.58.236-20170816142241/@comment-26411685-20170817033131

No, her name is "Kouhai Mitsuko" (高杯光子). The romaji prouncation is the same as junior, but the kanji is different.

This is what Mr Overweight meant when he said "Kouhai (高杯 - her name) is a kouhai (後輩 - junior), so your name from now on is 『Junior-shi』".

"Hikari" is just a nickname Kouhai picked because it's a cool anime name and that she didn't like her real name. I assume she took this from the "mitsu-" part of her surname which uses the similar kanji for "light".