This is without a doubt one of my all time favorite adult mangas (maybe the all time favorite). The whole young man getting not one but two incredibly, gorgeous, older women desiring him...is just right up my ally. The artwork was just beautiful, and the story was pretty fun to read. The whole relationship Shinji had between Yumi and Nami...I just couldn't get enough of it. Every time I read a chapter, I just kept getting so into it - I actually wish it was an ongoing series. I only wish that Shinji wasn't the dull and lazy student, because I feel it's used too often. If Shinji was a nice guy who was smart and good with kids, that to me might have worked better.
Also, the "secret relationship" Yumi and Nami had in their teens...I just adored. Many other people might have been grossed out or complained about it - but I'm not one of those people. And I was glad to see that they didn't shy away from restarting where they both left off after getting together with Shinji. Honestly, I wish there was more adult work where the older women/siblings "experimented" with each other. I seriously hope that one day this manga is animated; and it stays faithful to the source materiel. While I really wish it would have continued, I'm satisficed with Shinji having a happy ending with Yumi and Nami.
