Kobun (子分) (underling). A kouhai (後輩) is a coworker (of the same rank) but who has less experience and is expected to look up to a senpai. This girl is explicitly lower-ranked than her girlfriend.
I might get a little more used to it if we lived with each other and held each other every night.Because if this gets out, it might cause harm to your career, vice-chief Amagusa...But still, you have to get used to it.I don't care if they know.You're right...Hmmm...I guess...B-But if we start living together, won't that make it even easier for people to find out...?I just want to be with you...