noun
number of episodes; number of chapters
Used for the total or current count of episodes in a TV series, or chapters in a manga or serialized work.
このアニメは全12話です。話数が少ないので一気に見られます。
This anime has 12 episodes in total. Since the episode count is low, you can watch it in one go.
連載中の漫画の話数がもうすぐ100話に達する。
The number of chapters of the ongoing manga will soon reach 100.