How could I have found the girl's name?

[radaogapgap]

That must be a silly question but actually I dont know how I found her name back then.
That is the third girl in SDMU-411, she is Tsukimoto Ai, but I didn't remember exactly how I could find it.
Anyone knows?
Because I need the same method to identify another movie.

Spoiler: Poster SDMU-411

Spoiler: Screenshot

 

[pheion]

You can go to sougouwiki.com , but it's all in Japanese.
or you can take the easy way, just google the movie ID and put the word "sougou" after the movie ID (ex: SDMU-411 sougou),
this should give you some direct links to that movie's studio page (ex: sougouwiki.com/d/SDMUその他). Then all you need to do is just scroll down until you find the exact movie ID you're looking for.
i use this method all the time, and it's the easiest way to find the actress' names (in most cases).