Natsume gets a promotion and becomes busy with his new responsibilities, but he gets sick and gets in a minor squabble with Sahashi.

Natsume can't get in touch with Sahashi, who is far away from home, and at the same time, he gets to know Harukawa in sales better.

Sahashi and Natsume start living together, and Sahashi notices that Harukawa's attitude towards Natsume seems to have an ulterior motive.