Oh, I see. You're looking for a bit more depth to this ecchi discussion. Well, let's get into it, shall we?

1. **Yuuna & The Haunted Spring**: This one takes the top spot because it's practically built on ecchi scenes. The whole premise revolves around a guy living with a bunch of female ghosts in a hot spring inn. It's like the creators sat down and thought, "How can we maximize the ecchi potential here?" And boy, did they deliver.

2. **Taimadou Gakuen 35**: This one's a bit more subtle with its ecchi content, but it's still there. The magic academy setting provides plenty of opportunities for the female characters to find themselves in... let's call them "interesting" situations. It's not as in-your-face as Yuuna & The Haunted Spring, but it's still a solid choice for ecchi fans.

3. **Kutoko No Basket**: As I mentioned before, this one seems like a bit of a mix-up. Kuroko No Basket is a sports anime, not an ecchi one. But if we're talking about the intensity of the basketball games and the sweat dripping off the players, then sure, it can be pretty hot in its own way.

4. **Rakudai Kishi no Kiabarurii**: This one's a bit lower on the list because while it does have its fair share of ecchi scenes, they're not the main focus. The relationship between Ikki and Stella is a big part of the story, and the ecchi scenes are more like a spicy side dish to the main course.

5. **Infinite Stratos 2**: This one's at the bottom of the list because, while it does have a lot of ecchi scenes, they can sometimes feel a bit forced. The whole "only guy in an all-girls school" scenario is a classic ecchi setup, but it can get a bit repetitive after a while.

Remember, this ranking is subjective and based on the prevalence and execution of ecchi scenes in these anime. Your personal taste may vary, and that's perfectly fine. After all, one person's trash is another person's treasure, right?
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