Naisho no Tsubomi (ないしょのつぼみ) is a three part OVA about Tsubomi Tachibana and how she is the most naive girl on this planet. It's difficult to explain but she doesn't know anything about anything which makes me wonder where her friends get their information. For example, when Tsubomi tells her friends that her mother is pregnant they basically call the poor woman a pervert for having sex! Tsubomi didn't even have a concept of conception before that moment.

She's also dumb! When Tsubomi starts her first menstrual cycle she doesn't tell her mother in fear of worrying her. I can forgive that she doesn't know she's having her period but vaginal discharge is not the type of thing one should keep silent about!

It's like an anime version of Are You There God? It's Me, Margaret only worse. There's also a supernatural element to this OVA that, I think, has no business being there. Watch as she learns for the first time that penises exist.

I don't even know what to say after that.