No problem.

The Chapter House is home to Interactive History games, where usually the host posts a story, and at the end of a chapter multiple options for the players. The players decide which option they wish, and this influences the next chapter.
What don't you understand for the games like Ran No Jidai? Ran No Jidai is a mod(ification) for Rome:Total War. This means you must have the original game to play them. Modifications change files, improve the game, add new options, etc. It depends on the mod.

Does this help?