Erika Change is a Girls und Panzer 4koma doujin by Sutahiro.
After the incident in which Miho's decision to save a tank cost Kuromorimine the tournament, she announces her decision to transfer to Ōarai. Maho, however, talks Miho out of the decision, but as a result of the arrangement she set up Erika ends up having to transfer in Miho's place.
The doujin contains examples of:
- Adaptational Nice Guy: While Maho always cared for Miho, in this doujin, she's able to be more open with her feelings.
- Adaptational Personality Change: Miho loosens up a little while staying at Kuromorimine, especially after seeing the highly embarrassing video of Erika doing the Anglerfish Dance.
- Ambiguously Gay: Erika's strong loyalty toward Maho is ramped up into a lesbian crush in this fic. Assam proposes that "There is a 97% chance that she(Erika) is lesbian."
- Battle Discretion Shot: The entirety of the fighting in the practice match happens off-panel.
- Bittersweet Ending: This story has Ooarai winning the national tournament and not getting closed down by MEXT, just like in canon. Except, Erika decides to leave Ooarai and returns to Kuromorimine exactly after the winning ceremony. It is safe to say that Ooarai would not win the national tournament again anytime soon unless they become big enough to attract potential talents from Senshadou junior camp.
- Brutal Honesty: Yukari bluntly tells Erika that she would have preferred that Miho transfer to Ōarai instead of her.
- Butt-Monkey: Erika is often the victim of misfortune of one sort or another.
- The Coup: One happens in St. Gloriana right before the finals. Led by Rurukiri (with Rosehip involuntarily tagging along), against the whole Tea Garden when she arrests Darjeeling for her increasingly depraved behavior.
- Comically Missing the Point: When Yukari is asked why she's wearing the Family Mart uniform, she says "Because Sunkus no longer exists."
- Combat Pragmatist: Erika proposes taking an observation point and shooting any tank that approaches, a tactic Yukari thinks of as honorless.
- Compressed Adaptation: Many scenes are cut out, such as Hana's encounter with her mother while in port,
- Continuity Nod: Hana says that St. Gloriana has one tank that's too strong, and Yukari argues that even Miho would have trouble with them, a reference to how Miho defeated three of St. Gloriana's tanks (with Hippo Team defeating another), but ultimately lost to the last remaining tank
- Curb-Stomp Battle: Oarai vs. St. Gloriana. Unlike in canon, in which Ōarai was able to defeat all but one of St. Gloriana's tanks before being taken out themselves, Ōarai tries to stand against them at the ambush point, and gets wiped out.
- Flanderization: Many characters have their behaviors and personalities ramped up for hilarity.
- Erika is a haughty, overconfident Jerk with a Heart of Gold with an obsession of the Nishizumis and hamburgers.
- Darjeeling is now a Psycho Lesbian interested in Erika.
- Nonna at one point becomes a full-blown lolicon obsessed with legally adopting then marrying Katyusha, with a little push from Darjeeling.
- For Want Of A Nail: What if Erika, not Miho, had transferred to Ōarai?
- Honor Before Reason: Erika realizes that the most sensible thing for Saunders to do after catching Yukari infiltrating their school would be to change their tactics, thereby rendering Yukari's information useless. Kay, however, refuses to do so, saying it would be "rude" to Sgt. Oddball.
- Hypocritical Humor: Erika protests the team getting creature comforts for their tank, but when Mako suggests buying a hamburger pillow, Erika suggests that they buy two.
- In Spite of a Nail: While the manga generally follows The Stations of the Canon, some plot points stay the same in spite of Miho's absence.
- Miho ends up befriending the rest of Anglerfish Team around the time of the tournament drawing.
- Yukari comes up with the names for the teams after corresponding with Miho.
- Irony: In the Pravda chapter, Erika feels like she is becoming too influenced by Miho. So she decides to do something that she thinks Miho would never do to raise morale - the Anglerfish Dance.
- Japanese Honorifics: For the most part, Erika doesn't use honorifics on her teammates, unlike Miho. The only exception is Hana, who Erika apparently respects enough to call "Hana-san."
- Jerkass: Erika, like in canon. Much of the humor comes from how poorly she gets along with the rest of the team, particularly Saori and Yukari.
- Jerk with a Heart of Gold: Erika again. The Pravda chapter shows that she does care about her teammates. Earlier chapters also show her coming to care about Ōarai.
- Jumped at the Call: Unlike Miho, Erika eagerly accepts the offer to do tankery at Ōarai, even choosing tankery as her elective before it's even listed.
- Madness Mantra: Sodoko is reduced to screaming nothing but "DISCIPLINE! DISCIPLINE! DISCIPLINE!" for a good portion of the series, after the sight of a chaotic three-way battle between Koume's Panther, Anzio's P40 and Oorai's team on school grounds breaks something in her psyche.
- Psycho Lesbian: Played for laughs. Darjeeling is Flanderized to the point of becoming obsessed with carefully observing any moments of girl-on-girl action and teaching others the virtues of loving the fairer sex.
- Real Life Writes the Plot: Lampshaded when Yukari wears a Family Mart uniform rather than a Sunkus uniform as part of her infiltration of Saunders. The translation notes explain that Family Mart acquired Sunkus in 2016, which is why the Product Placement for the latter ceased.
- Running Gag:
- Mako and Erika bonding over their love of hamburger.
- Saori trying convince Erika of superior hotpot dishes over the latter's favorite hamburgers.
- Whenever slapstick happens, the narration will point out that "X has been specially coated with carbon for safety."
- The tanks are often rendered as cartoonish blobs with cutesy faces and treads when viewed from Saori's perspective, as if to show how she can't tell them apart.
- The St. Gloriana characters discussing Erika being a lesbian.
- Shout-Out: When Momo and Yuzu panic and deny that Oarai will be closed if they don't win the tournament, they both insist that this isn't some kind of anime like "Something Live Sunshine".
- Trademark Favorite Food: Mako and Erika both love hamburger.
- Wham Line: When Erika meets Miho at the tank café.Erika: I guess it's "former-vice commander," now. (aside) You got demoted after that, didn't you?
Miho: Yeah, you're right. I'm the commander now.- Also when after the Pravda battle when Miho tells Erika that Kuromorimine lost against St. Gloriana.
- Worthy Opponent: Averted. St. Gloriana apparently refuses to recognize Ōarai as such due to its pitiful performance in the first battle.
