Living in the neighbourhood and sushi being my favourite food I've definitely been to all the Japanese restaurants on the Danforth. Casa is my 2nd favourite. First is Aji Sai (not affiliated with the Aji Sai at Queen and Spadina) east of Pape almost to Jones. The service is mediocre but the food is consistent. I'd come here more if the service improved, mostly the staff just aren't as friendly and often awkward. I can only assume they couldn't care less about their performance.
My favourite dish here is the kani salad. It doesn't sound that special. Shredded crab with lettuce, cucumber, tomato, tobiko, Japanese mayo and their house salad dressing all come together to become a comfort dish for me. Those ingrediants just please my taste buds and I'll come back for more on the next craving.