I'll save you the trouble and say that the first episode of this is pretty boring and seems to try to build up some sort of more intimate romance between Airi and her step-dad. Ultimately, it gets overshadowed by the sex scenes which are very boring and sub-par compared to the much better scenes this hentai has done before. You really aren't missing anything if you decide to skip the first part aside from one very persistent guy and a stalkerish and very intrusive lifeguard.
Now the second part is MUCH better. If you feel that Sana doesn't get enough screen time, then you are in for a great treat! She comes back and has a very naughty and erotic time with the step-dad. She has also matured in all the right ways and has a very womanly body but she is still as cute as she was before. Not only that but the romance between Airi and her dad is done so much better in the second part as well. The ending leaves off on a cliffhanger that signals to more episodes but it might lead to some genres that not too many are fond of.
With the second part redeeming the very boring first part, I give this a 7.25/10 for now.
