MUM-313 - Taking Back My Sister

*I was drawn to the cover and the title, so I decided to watch it. My younger sister, Ai-chan, was so innocent and cute. She has an attractive face that doesn't look too skinny. The atmosphere between Ai-chan and Onii-chan in the opening scene was really good. I was really looking forward to it. Well, the content...unfortunately, it wasn't what I was looking for. Apparently, my brother has a special ability and can see Ai-chan having sex with her boyfriend from outside the room. Oh, is that so? Is that the kind of story you want? Also, you can see how Ai-chan takes a bath and how she plays alone in her room. It seems like Ai-chan suddenly broke up with her boyfriend. One day, Ai-chan found her brother doing it alone. So, I'll help you. I want to get better at naughty things, so I want you to teach me. Another day, I practiced using my mouth with my brother. Another day, I licked each other with my brother. I guess this has given me confidence. Also, Ai-chan is flirting with her new boyfriend. Just when I thought my brother could see through it, he suddenly barged in! Eh, what? What does this mean? Huh? My boyfriend doesn't notice. Ah, is that so? Well, I guess that's probably the case. It's an important line in the story, so I can't write more about it because it would be a spoiler, but if that were the case, I think it would have been better to elaborate a little more. No, this was actually a bit disappointing for someone like me who wanted to see a story about a little sister and a big brother. Hmm. There are a lot of things that don't make me feel sick. Anyway, the "?" was annoying, and Ai-chan's sex scene, which was supposed to be the highlight, didn't appear at all. I think this will disappoint not only people like me who watch it for the brother-sister thing (they're actually older brothers), but also people who watch it for Ai-chan. Creator, what did you want to do? I don't really understand. And the last scene is obviously a bummer. That's not to say it's boring, and it's not that I'm angry, but it just feels off... My thoughts are... It was great to see cute Ai-chan trying her best to cum a lot. It was great to see so many cute costumes. Other than that, things don't go well. Yeah, it's a piece I'd like to hear other people's opinions on.