TURA-156 - Housewives showing their panties for 1000 yen

I bought the 'Best' edition first, and after a long time, I bought the entire series. It turns out the actress who appears at the very beginning of volume 1 and volume 8 is exactly the same. I don't understand why the same scenes are repeated when it's not even a 'Best' compilation. I went through the trouble of buying the whole series including the 'Best' edition, and this just kills my motivation to watch it. There's no need to buy both 1 and 8; if you don't care about image quality, the 'Best' edition is enough. If you do care about quality, volume 8 is better than 1 because it has a longer runtime for the same price, but it's not really a work I'd recommend.