Anime version of: Lamune Yoake Mae Yori Ruri Iro Na Both are based on VNs (which I'm sure you already know), but the anime versions really ensured the pairing of the MC and the main heroine, as it's the intended canon story on their VN counterparts. The romance is nice and sweet, and pretty entertaining. In Lamune, it's pretty clear from ep 1 up to the end that they are meant to be, even if no words needed to be said between them (also, Yuuko Gotou!). In Yoake, they hook up pretty early, or maybe about halfway through. Some drama at the end for both series though. If you don't mind an older series and you haven't seen it yet, I highly recommend Ah! My Goddess. That's my childhood right there and it's a classic romance series (it's originally a pretty long manga by Kosuke Fujishima, though it already finished pretty recently. There are a couple of anime seasons, OVAs, as well as a movie too). The only annoyance is that the MC is spineless and too shy to confess, but there is absolutely no doubt from the start that the two have mutual understanding of their feelings for each other. Series is, for the most part, basically about them developing their relationship. There's a little bit of harem, but the MC is only interested with the main heroine so it's not really that harem-ish.