阶梯倍投方案胜进模式简介：Hey, Yokota-kun, I'm very happy that you can come. Please help me come up with an idea. Now my head is getting big and I don't know what to do. You said just now that you can't let go. What do you mean?
Hey, Yokota-kun, I'm very happy that you can come. Please help me come up with an idea. Now my head is getting big and I don't know what to do. You said just now that you can't let go. What do you mean?
