From MangaHelpers:

After both his parents died, Yoji was in a daze for a couple months, just drifting through the days until his grandma finally snapped him out of it. He started to take his art school more seriously and began helping his grandma manage an apartment complex. A new tenant moves in at the beginning of the school year. Ichimura Minato is a year above Yoji in the same art school and they become close due to them always being near each other at home and school. They start a complicated relationship with both sides unsure of what they want from each other whether it be just physical, just a friendship or something more. [vyc]