Huh. You might well be onto something there.
It seemed watching it almost as if they weren't even trying to do any comic timing - instead, most of the dialogue was at the same slow, trudging pace. And that especially stood out to me because it's clearly conveyed in the manga that one of the characters is sort of manic and talks much faster than the other one. And yeah - overall it just felt slow to me.
And I'm fairly sure there was less dialogue overall - that the monologues from the manga were shortened. Which would also fit in with low budget and dumb corner-cutting.
Description
Due to certain circumstances, Heike Waku transfers to a new high school. There, he meets a very cool classmate named Oura-san. With a famous model for a sister and a face that never smiles, she seems like a distant and untouchable presence… or so it seemed. But by chance, Waku happens to catch a glimpse of Oura-san's dazzling smile. In that moment, his world changes completely! For that smile… I'll do anything!! From Taamo, the creator of House of the Sun, comes a heart-pounding, grin-inducing high school romance!