It's Not Just Strawberry Cake That's Red and White, It Could Be XX Too! (Gintama)

Shinpachi: “The Land of the Samurai.” It's been a long time since our country was known by that name. Twenty years ago, aliens called the Amanto suddenly descended on Edo. As their power grew, the samurai gradually fell into decline. In this era, only one man still possesses the soul of a samurai. His name is “Sakata Gintoki”... Kagura: Shinpachi, that opening is so clichéd, aru. Gintoki: This is fanfiction, Kagura. We have to explain the setting for readers who haven't seen the original, don't we... Hijikata: Are there really people who read fanfiction without having seen the original? You think way too highly of yourself, bastard. Gintoki: Toshi~As the main character, you've got to be ready to handle all kinds of unexpected trouble at any moment, I say. If you can't even think of that, can you really call yourself the Shinsengumi's brains, Demon Vice-Commander? Hijikata: Who are you calling Toshi, you natural perm! Nimi: ...Hey...you two, are you having another bout of chuunibyou? Gintoki/Hijikata: ... Nimi: Well~that's pretty much what it's like~ The end. Lesson One: The truth behind a ghost story is often just a bad joke Lesson Two: “Not living up to your name” is often exactly what you do Lesson Three: A nickname is pointless unless you say it to the person's face Lesson Four: People change because of the people they meet Premise: