Hito Wa Naze Hataraka Nakerebanaranai No Ka summary:

5-6) Bokura wa Tada Hashiru DakeFor ten years Kousuke has followed Tomonari-senpai, from high school to college and now the company at which they both work, all the while telling himself that their friendship is enough for him. Kousuke's world tips upside down when he finds out two shocking facts in one evening that change his perspective on Tomonari drastically.7) Call MeOne day the phone rings and its some guy you met at a business function some time back. For some random reason he keeps calling once a week at the same time. Simple chit-chat, nothing special. Just when did that routine phone call begin to make me feel this way?