I wanted to be able to use the bay window at night as well, so I basically left it fully open during the day to make the most of the space, and when I closed it during the day, I wanted it to be bright without blocking out the light, and at night I wanted it to be a blind. I was a little worried because there weren't many images or reviews of it at night, but unless you get right up to the window (10cm away) or use a spotlight to clearly show the shadows, you won't be able to see what's going on inside at night (the light will still be visible). It's a little more solid than the strongest blackout curtain at Nitori. 【Installing the large size is a little difficult】 There are times when you have to lift it with force on both sides of the 180cm curtain at the same time, so it might be difficult for people who are not confident with their strength or who are small to do it by themselves. 【Dealing with the noise when the curtain touches the rail】 If you open it fully with force, it will collide with the curtain rail and make a clattering noise. There is a stopper-like component about 3mm in size in the middle of the chain, which looks like a bread bag fastener. If you replace it so that it stops before it is pulled out, it will improve a lot. However, the component is too small, so I think that people with large hands or long nails will not be able to attach and detach it (you don't need to replace it often, and I am grateful that this component exists. It would be good to have two for both raising and lowering).