Conversation

I got a very nice question.
I'll explain it right here.

This story shows why.
https://www.dlsite.com/maniax/work/=/product_id/RJ01099320.html

Her real name is Ikumi.
But she decided to become Kumin.

In another story, though, she is called Ikumi,
they were not yet close enough to call each other by their nicknames.