Plz dont tell me introducing this new male vampire lord is to give a cliche male interfere in yuri couple plot point.
I'm not entirely disagreeing with your points, see above - but you have actually read the manga, right? It basically torpedoes any cliché it comes across immediately. Whenever there's any situation where some trope-ish drama might have started everyone just goes "it's no big deal" and the "story" moves on.
I agree that the manga probably failed to draw in readers properly after the first three-four chapters with something a bit more tangible; something where you can just simply go "this is what's it about".
Personally, I like the slight-paced slice-of-life-ishness and if it had whatever original length it was planned for, I'm sure it would have been worth following it, too. Now the pacing just feels off as it's too short for the carefree meandering about ^^;