It seems everything got settled down finally since I changed the OS of my PC from Windows7 to Windows10. Whew!
As a result of it, now I can use the latest version of the application, Adobe AfterEffects now. The one I used to create GIF animation before. Here is the result! To celebrate Rugby Football World Cup Japan, TA-DA!!, a horny rugby player with a wobbling cock!
How is it different from the previous one? Well, the production process got changed drastically since the latest version of AE has brand-new Puppet Pin Tools.
Besides that, I've found out how to create an "extra-smoothly moving" animation. Whenever I saw such animation on the net, I was always curious about how the animation, the one called "nuru-nuru ugoku anime (extra-smoothly moving animation)" in Japan, is made. I guess this is the answer. Well, it was nothing to do with the version of AE though, it's all about the "frame rate". 24 frames / sec is for film movie, 30 (29.97) frames / sec is for video. On the other hand, this one is 50 (50.94) frames / sec. Well, for those people into creating animation, it might be a matter of course though :P