See the tags below to find more on these extra chapters. Some tags might not populate right now, but eventually they should.

Edit: I’ve decided to add overviews of the chapters here, in case you forgot which chapter is about what. This is what I recall about them. 😏

Anthology 2, “With Father” (no real timeline): Vincent, Diedrich, and Tanaka are in a questionable reality. Vincent is reading a copy of Anthology 2, apparently brought to him by Undertaker. He tells Diedrich about an old photo of young “Ciel” in a dress. No twin reveal yet, so wording is vague. This chapter is in Anthology 2. But he’s reading Anthology 2. But this chapter is in— 🤯

Ch96.5 That Butler, Friendly (circus arc): Our earl has a loose baby tooth while he’s posing as “Finny” at the circus. Sebastian is determined to remove it.

Ch99.5 That Butler, Nursing (end of circus arc): Sebastian makes a meal for our earl while he’s recovering from an asthma attack, after returning home from the circus. Flashback to when Vincent gets Diedrich to make a meal for Rachel (and our earl has some, too, but the twin reveal hasn’t happened yet, so the visuals and wording are vague on purpose). [[This is touched on later, in the serial chapters, when we get to see real Ciel bring some of that meal to our earl, apparently after our earl had decided to return to their bedroom. But the treatment is different. It might not be the exact same occasion, but the recipes are the same.]]

Ch101.5 That Butler, Requested (after murders arc): Sebastian basically visits Arthur in his dreams, prompting him to write more stories about Sherlock Holmes. We see Arthur dreaming about classic children’s stories, mostly written by Hans Christian Andersen, but all the characters are replaced by Kuro characters. Some of them Arthur has never even met. He wakes up, terrified, and resumes writing about Sherlock.

Ch107.5 The Devil Six, Uninhibited (no real timeline): The Kuro characters have been ranked by the fans, so it’s the only extra chapter that appears in GFantasy and the manga volumes (so far). This is the “Akuma6” chapter where they wear rank rosettes, and the Viscount of Druitt starts a fight over Vincent’s portrait’s #5 rosette. Druitt becomes the protagonist of the series for a moment, Finny becomes extra swoll, Grelle never grabs it but imagines the effect it would have, and Snake’s snakes turn into a basilisk-looking monster that Sebastian has to destroy. Druitt’s party is ruined, so they all go to Phantomhive Manor for a huge buffet. Undertaker tries to revive Vincent with his own higher-ranking #3 rosette, but it only lets Vincent break the fourth wall long enough to tell us about this incident... and how love is beautiful but can also lead to destruction and tragedy.

“The Butler, Requested” is a side chapter that was included in the original Japanese release of the Book of Murder DVD/Blu-ray. It has yet to be serialized, but it’s often referred to as ch101.5.

Here’s a link to a Facebook page where it’s been translated and uploaded. I don’t think any licensed translation exists, but this fan translation looks pretty good to me.... https://m.facebook.com/media/set/?set=a.591622940937235.1073741840.318870851545780&type=3