Totsukuni no Shoujo [dear.] Bangai-hen

It was inevitable that the road walked by Teacher and Shiva would be sorrowful, but not all of their times together were bleak. Many of their days held quiet, shimmering joy; comfortable days of sunlight and soft breezes where nothing of significance happened. Days that remained unseen…until now. These are the side stories of two people—one human, one inhuman—who linger in the hazy twilight that separates night from day.
(Source: Seven Seas Entertainment)
Note: Chapter count includes one bonus chapter.