I don't really listen to otome game spin-off Drama CDs that much, but I browse the otome section on DLsite a lot, so I have some thoughts I can share about these kinds of audios.
Actually, what we call "binaural audio" is usually referred to as "Situation Voice" (シチュエーションボイス) or "Situation Drama" (シチュエーションドラマ) in the Japanese community. If a dummy-head mic was used for recording, it will almost always be prominently highlighted in the product description. After all, dummy-head mics are way more expensive than regular ones, so it's a major selling point (and naturally, these works tend to be priced a bit higher).
The level of immersion you get from a dummy-head mic is something regular equipment just can't match. Because of this, the core focus of these works is "self-insertion"—letting the listener step into the shoes of the heroine to interact with the male lead, fall in love, find comfort, and even engage in intimate acts (which is exactly why most of these audios are R-18). This is completely different from traditional Drama CDs. Situation voices are a "first-person experience," whereas traditional Drama CDs treat the listener more like a "bystander" or third-party observer listening to the characters' stories. The creative approach behind the two is fundamentally different.
Here are a few really good all-ages (SFW) works I'd recommend:
https://www.dlsite.com/girls/work/=/product_id/RJ01142235.html
On a side note, I've noticed some creators in DLsite's BL section experimenting with dummy-head mics for BL CDs or situation voices. To be honest, my personal listening experience with them was a bit... awkward. When listening to a BL dummy-head CD, the 3D audio makes you feel like a "third wheel" awkwardly sandwiched right between the two male leads. And for BL situation voices, you basically have to self-insert as a guy...

(Of course, I'm sure there are listeners who enjoy this unique experience! I'm just sharing my personal feelings here, no offense intended at all.)