The premise for this manga is so fantastic. I didn't know how much I wanted it until I had it.
Basically, a 34-year-old woman has had so many relationships fail in so many ways that she's lost the ability to love. She meets a 24-year-old woman who has never been in a relationship at all. Everything they do together is a first for her. Because of this, she's simultaneously both childish (she really wants to do stereotypical things like go to a theme park together while wearing animal ears and riding the ferris wheel) and daring (because she's never had a sexuality before now, she has never faced societal pressure or rejection).
Both of them are so different yet so great together. It's wonderful.
Edit: And towards the end it all goes wrong.