Hongyo is not autistic. He's an introvert who never seems to actively think about his own feelings. So its more like being emotionally shut down. In the last episode he admitted to feeling self conscious. He didn't understand what terada saw in him.
Hongyo did what Hase told him to because he is use to being bossed around by him. Hase implied he wasnt contributing to the house and used his old work relationship to ensure compliance.
I was actually horrified that Hase took advantage of his position in Hongyos life to manipulate him into hurting Terada. Was so cold blooded. Poor Terada and Hongyo walked right into that trap.
I was surprised Hase actually admitted to what he did in the end too. But it was really awful to watch this needy person bust up their budding relationship. No one ever told him what happened between them in middle school tho. So he had no way of knowing just how deep their connection was. Since both of them seemed to like living in denial for most of the show.
Terada and Hongyo finally managed to be tender and intimate enough to hug after she read his book. So it was the beginning of a new chapter for them. Was happy with the story and the complex characters. I think they wrapped it up pretty nicely. Am not expecting a second season.