If I'm honest, I did not expect him to choose Watanabe, mostly because she came into the story after ichikawa. I'm happy with this ending, but unhappy at the same time because ichikawa was sad. Sensei was put in a really tough position where he had to make either one or both of the girls sad, so I'm sympathetic with his hesitance to answer for so long. I really enjoyed this manga, even if ichikawa was a lol cucked.