Hello everyone,
Here we are to talk again about Itsuka Tenma no Kuro Usagi that with the fourth episode start to shed some light about what will be the content and the focus of this series. Fanservice apart, of course, as that is being made pretty clear by these four episodes! (By the way, the OP animation is in some scene almost criminal)
In this episode the main focus is taken by Saitohimea "fighting" against one of her creation that want to take her away from our protagonist to protect her. While the whole emotional affair was well done, I am not sure why they couldn't cooperate together to improve the defense of Saitohimea? Why only one of the two must be with her?!
We also finally understand clearly that the seven deaths counter reset after a certain number of minutes making our protagonist more invulnerable than ever. Unfortunately he's also quite stupid and continues to get impaled by pretty much everything that moves, so seven lifes may not be enough.
Another important note regarding the episode is that Saitohimea get "wild" at the end of the episode trying to seduce our protagonist and this is another big question mark of this series. Why our protagonist isn't jumping on her accepting her proposal?! 
Going far away from the main protagonist, on the other side of the fence we have Haruka Shigure going demon (judging from the OP it will be an ally, so I don't really have a big worry about her well-being) and explanations about why Gekkou's sword doesn't work on the Tenma. (What a convenient plot device, the only race immune to the sword is the enemy army...)
At this point after four episodes we are here with a lot of questions about the future; the most important batch of questions are related to the evil Hinata Kurenai. (Fukuyama Jun). Why is he still alive? I thought we saw clearly the ball being cut by Gekkou in the second episode. Who are the Tenma and why they follow Hinata if they are so powerful? Why they want Saitohimea dead?
There is plenty of material to be covered judging from the light novel (8 + 3 volumes) and I'm really curious about the length of this anime adaptation. Will it be 13 episodes or 24/26 episodes?!
Concluding, this series has been highly underrated compared to other titles, but till now has kept a consistent level of quality for four episodes and I'm find myself more eagerly waiting for a new episode of this compared to other series. (though I admit that sometime the fanservice is a little too much 
)
I'll continue to follow this, let's hope to get more Haruka/Mirai screentime in the following episodes!
See you soon,
feal87