FGO Pulls Off the Ultimate Two-Timer: Castoria Gets Split Into 'Original' (Ships with Muramasa) and 'Clone' (Ships with Player) — Nasu's Cuckolding Lore Sparks Community Meltdown

You thought the waifu bait was over? Nasu says: hold my Holy Grail.

FGO's latest swimsuit event has once again managed to send players' blood pressure through the roof. The victim this time? Castoria — or more accurately, Castoria who just got chainsawed in half by the writing team.

Here's the context: In FGO's Chapter 2.6 (Avalon le Fae), the protagonist Master saves Little Castoria and the two go on a whole chapter's worth of adventures together — widely considered one of the best romantic storylines FGO has produced in recent years. The ML (Master Love, i.e., character-to-player romance) was absolutely loaded.

As the story progressed, Little Castoria evolved into Big Castoria (the Holy Sword wielder variant) through a sword-forging ritual. When summoned as a Servant to Chaldea, Big Castoria simulated her younger self's personality using memories.

Then came the absolute galaxy-brain move: in the swimsuit event (Swimsuit 8, this year's summer event for CN server), Nasu's 'substitute character' addiction kicked in. He forcibly split the simulated personality into two separate characters — Little Castoria keeps shipping with the player, while Big Castoria goes off to be lovey-dovey with Muramasa (who is essentially Shirou Emiya in a different vessel). Yes, THAT Muramasa.

The original post nailed it: Big Castoria and Muramasa had zero romantic connection in Chapter 2.6, but Nasu doesn't care. This is the classic gacha bait-and-switch — reel you in with a full chapter of waifu bonding, then cleave the character in half: one half stays yours, the other half ships with the author's self-insert OTP. Master Love first, canon pairings second, milk both sides.

The top comment (1F) said what everyone was thinking: 'The operation of selling ML first and then selling CP on the side is truly unhinged.'

A veteran player pointed out this is par for the course with TYPE-MOON: 'It's TYPE-MOON after all — they already split a form for both Princess Arcueid and Shiki to do ML. The Mahoyo collab is probably going to be the same.' This reveals that Castoria isn't an isolated case — Nasu has a pattern of character-splitting to serve both camps.

One commenter went even harder: 'In web novels, the clone NTR trope at least targets the male MC. They actually managed to NTR a FEMALE character with a clone — I genuinely cannot fathom what goes through these writers' minds.' Even in trashy web fiction, splitting a female lead into 'one for the harem' and 'one for the canon ship' would be considered peak degeneracy.

Of course, the comments weren't all one-sided. One defender tried the 'it's a general-audience game, they can sell however they want' angle, before pivoting to drag in Girls' Frontline 2's infamous Raymond incident as a whataboutism. Another thread debated the in-universe lore — but was quickly corrected: 'This isn't the usual Throne of Heroes original-vs-clone distinction. This is the same Servant literally creating a copy of herself to entertain two different love interests.'

The clapback from GFL2 players was savage: 'A Girls' Frontline: Bakery Girl player crying about NTR — you can't make this stuff up.' The pot calling the kettle black at its finest.

One pragmatic fan said: 'If it were the real Shirou, I might accept it. But it's just Muramasa.' Even among Fate fans, there's a huge difference in acceptance between the OG Shirou Emiya and his pseudo-Servant vessel. And another simply ragequit: 'Nasu is trash, he's always been like this, I'm done.'

One commenter dropped the ultimate lore truth bomb: 'Nasu not writing NTR would be the real surprise — even Mash nearly got deflowered by Cernunnos in 2.6.' At this point, the community treats Nasu's cuckolding tendencies as a feature, not a bug.

Finally, someone asked the philosophical question: 'What even is an "official doujinshi"? Official and fan-made should be mutually exclusive concepts, right?' — referring to the manga that depicts Castoria and Muramasa dancing together. The name itself is an oxymoron.