I really liked the story. First all three of them acted as big jerks and cowards for running away from their own feelings. Running away won't solve anything. The mangaka showed how people run away from their feelings/problems, how they avoid to take the road which leads to pain so they choose to not see that path. Here Kataou was a big coward for not accepting Miwa's feelings and introducing him to Hoshina, Miwa trying to find comfort in Hoshina's arm and obviously Hoshina for helping Miwa to get his love. I mean dude you should always grab the opportunities and first think about yourself plus even though he knew everything from the beginning he still choose to be with Miwa instead of not being with him. So in short he asked for it clearly. But still i felt so damn bad for Hoshina. I'm sad. Hoshina deserves someone much much better who would understand him and lessen his sorrows.
Indeed it was a very twisted and sad story.
Kimi No Kao Ni Sasu Kage