It's really strange to see Harada drawing ecchi stuff.
that's because it wasn't him that drew this, all these ecchi bath pics don't even resemble his style, the actual artist of these bath scene images is hirano_katsuyuki, the main artist for the Agarest series, and the main artist for Mugen Souls itself is kei_nanameda, the way you can tell the art apart is the eyes and legs, especially the legs, http://tryph.tumblr.com/post/68452259419/btw-the-artist-for-the-bath-minigames-is-hirano look at this tumblr post to see what I mean.