In the next to last frame, Sensei talks about going home to brag to Tanaka about having an encore at a competition. A few pages before that, Tanaka tells his manager he is staying in Japan. His manager then tells him he has booked several shows for the year and Tanaka will then be managing himself afterwards. If Sensei is going home to brag to Tanaka and Tanaka stayed in Japan, the logical conclusion is that they are together.
In the next to last frame, Sensei talks about going home to brag to Tanaka about having an encore at a competition. A few pages before that, Tanaka tells his manager he is staying in Japan. His manager then tells him he has booked several shows for the year and Tanaka will then be managing himself afterwards. If Sensei is going home to brag to Tanaka and Tanaka stayed in Japan, the logical conclusion is that they are together.