I am a big fan of “Buffy the Vampire Slayer“ and I remember when Buffy finally told her mother that she slayed vampires. Her mother threatened to kick her out of the house. The next day Buffy was gone, she ran away from home.
I wonder how Ikuko would react.
Unlike Buffy's mother, I think Ikuko Tsukino would be impressed by her daughter fighting off the various nasties and entities of Chaos plaguing the universe.
Thumbs to the both of you.
I do sometimes think of Buffy the Vampire Slayer as a grim dark version of Sailor Moon. An ordinary blond 14-year-old schoolgirl is happily living her life when one day this random stranger shows up and tells her that monsters are real, and she is going to fight them no matter what. She gets a group of friends and flirts with a mystery man who fancies himself her protector... but she never tells her mother the secret. Heck she even has a mini me who was retconned into her family via mind control and magic. Fighting evil by moonlight and winning love by later moonlight (because y'know Angel's a vampire) she is the one named Buffy the Vampire Slayer.
But there are differences, the biggest of them is that there is the use, or non-use, the Masquerade and the Weirdness Censor/Sunnydale Syndrome.
As summarized from TV Tropes,
The Masquerade is that the show is nominally set in the real world, and yes the mundane aspects of it are... mundane. But hidden below it all, what's really going on is far different. An entire world hiding right there in plain sight. It gets its name from Vampire the Masquerade, an RPG about vampires being hunted by humanity and how they survive the hunt by hiding, infiltrating and controlling society from the shadows. Indeed, as far back as the original Dracula novel, Van Helsing said that the vampire's greatest strength is that people do not believe he exists.
As for
The Weirdness Censor it was originally called Sunnydale Syndrome because as early as the first Buffy the Vampire Slayer episode, the vampires in full bat face attack the school and the next day witnesses to the event say it must have been rival gangs fighting over turf. Buffy's mentor Giles just says, "They don't believe because they don't want to believe. They explain away what they can and forget what they can't."
Thus, when Buffy's mother learns not only that monsters are real but that her daughter is fighting them... she is horrified. She learns that her entire world is a lie and goes into meltdown.
Sailor Moon on the other hand... there is no Masquerade. I mean sure the Sailors don't give interviews or pause for selfies... but there's no real attempt to hide anything. There's no secret conspiracy. People see the Senshi fighting the monsters, people hear their speeches, people know what's going on. Maybe Joe Civilian has no accurate information about the Sailors, but they know they exist.
And that goes the same for the monsters. Sure, the monsters tend to disintegrate after being defeated and their victims often faint. A skeptic might say, "No body and so-and-so was asleep half the time, what proof is that?" Maybe, but it's kind of hard to stay in denial when at the end of the story arc, the villains go all out with all their monsters against the Sailors and don't give a damn if anyone sees!
So yes, if Mama Tsukino were to ever learn the secret, she would go into an emotional tailspin but... unlike Buffy's mom, Serena/Usagi's mother knows that monsters are real. She knows Sailor Moon is real. And yes, she knows that Sailor Moon is a hero. More than a few times did Sailor Moon personally save her Earth family from monster attacks.
So not only would Mama Tsukino not be left as messed up by learning the secret... she would likely be quicker to embrace and cheer her own daughter than Buffy's mother was hers.
Mama Tsukino: Young lady, you lied to me. You snuck out for years in the middle of the night, doing what trying to get yourself killed?! And you mind controlled me into thinking Rini/Chibi-Usa was my niece. Mind controlling your own mother! I am very disappointed in you.
Serena/Usagi: I'm sorry mom! It was the only way I could keep you safe...
Mama Tsukino: Yes. And for that... for saving us all, for those times you saved me and your father and brother... I'm so proud of you! Don't think you're getting off easy. You're grounded young lady. But... no matter what else happens, I will always be there. So come give Mama a hug!
Yeah.
