Hakoniwa no Toriko

He has been a recluse for the past 10 years in that big house overlooking a bicycle parking lot. One day, a girl approaches and confessed to him, disturbing the world he's been cooping himself up in. A oneshot of their story by the mangaka of Tetsugaku Letra and Watashitachi no Shiawase na Jikan. Published in the oneshot collection Watashi to Watashi.