Only the episodes TV broadcasted during the original run of the series are part of the regular seasons.

All other episodes should be listed as part of the Specials season.

@激萌小泰坦 said:

之前有个“物语系列全”怎么不见了？那个整理的非常好，有15季。 这个好乱啊，就比如第一季有15集，非要把3集拆到第0季，难受！

对啊，为什么非要强制按照播出来进行这么混淆的分组呢，名字是物语系列第二季，实际上却是第三季，为什么非要坚持误导观众呢

If you want the episodes in another order, you can use an episode group.