Update: +1 star. I came back to eat there this time, and the sushi was really good and fresh. The service was OK and the bubble tea was good but still too sweet. The restaurant is decorated in a kitsch way with anime characters on the walls and lots of cherry blossoms. The room and toilets are clean. The prices may be a little higher than in some restaurants but it's still reasonable.
Bubble tea sold as "medium" size but in fact it is a small size (smaller than normal size to be precise), they are not able to take an order when there was no one there and They served me another bubble tea which was sooo sweet and the pearls were not good. Too expensive for the size.