Short and sweet love story about getting a second chance with the one that got away, and religious guilt.
As someone around the same age as the characters, I resonated a lot with the feelings they had at the start of the game. Those feelings of someone you once loved but never had your chance with, times you could have had but didn't. Love that never flourished. Many people have those feelings I'm sure.
This game is about getting that second chance, rekindling a love that never was, and moving on from tragedy and embracing life again.
As one can guess, a big part of this game is religion. The titular Margaret is very devout in her faith, having been religious her entire life and previously being married to a priest. Much of the game is her struggles with this reignited relationship with her teenage crush, and the feelings of pleasure and lust she is having. I wouldn't say this game is "corruption" so much as it is someone embracing repressed feelings. Yes Margaret becomes more sexually liberated, but she is not corrupted. She still has her faith and believes in love.
I also don't think the main character is as dismissive of her religion as some others say. He still prays with her when she asks, tries not to say things that upset her, and even thinks maybe there is some divine providence that brought them together. He isn't religious, but he isn't trying to take that from Margaret. He primarily hates how religion, and her former husband, made Margaret repress her feelings and not be who she truly is, and how it made her ashamed of herself.
Art wise, I find it all really charming. The sex scenes aren't super well animated, but combined with the voice acting, it is a fun watch. There are quite a few repeated drawings, especially in the few montage sequences, but there is a bit more variety later on.
The voice acting is great, as well. Margaret is fully voiced and the VA does a great job showing her evolution from demure and shy, to cautiously becoming more lewd, to finally embracing it all. The few emotional scenes there are are very well delivered as well.
Overall, if you want a cute romance story that can be finished in a couple hours, you can't go wrong with this one.