Yeah, after chasing it down further (and watching the anime yet again for very important research purposes), most of the gal games / VNs / dating sims that might be like what we see in the manga are PC-based (and a lot of them are pret-ty lewd smh Tama-chan). There is a Love Hina game that has a very similar format on the GBA or GBC, tho.
Whatever, this has given me an excuse to try Tokimeki in Japanese (and also the original Sakura Wars, which is a good and very weird game).