If you want the story to fit the novel most accurately, then watch the first episode (the one where the whole episode is them doing fun stuff during the first loop), then watch the 2nd episode, but stop right at the beginning of the part where they talk in the café after doing everything on the list (on the 30th), which should be near the end. Then watch the episode that actually has the conclusion (which isn't shown, yet, but hopefully, that'd be this week's episode), starting at the café scene (on the 30th).
Edit: About halfway through the 2nd Endless Eight, you'll know the answer to that question of yours.