Gensokyo: My Tsundere Little Sister Is Kaguya Houraisan

Shinki Rin, a mysterious young man from the Lunar Capital. After losing his memories, he was found by his younger sister Kaguya and brought back to Eientei. And so, Gensokyo's vibe gradually became more and more surreal... [Shocking! The Scarlet Devil Mansion holds clues to his memories!] Shinki Rin: Top-secret Scarlet Devil Mansion raid-and-extract mission. Full gear, go on the offensive, type 1 to call for backup! Reimu: 111 Marisa: 111 Bro, are you really coming to get me? I'll block the bridge! Remilia: Stop blocking it for a second! I need to ask you something! ... [A startling turn of events! The Lunar Sovereign's fate is unknown!] Yakumo Yukari: Great! If their fate is unknown, that means they're dead! Shinki Rin: Mom, what a horrible way to die, ribbit! Sagume Kishin: I come first to mourn Your Highness, and second to offer congratulations. Kaguya: Congratulations, Brother! You can become emperor now! ... [It's all blown up! A major crisis in the Shinki family's love life!] Kaguya: Huh? How did you two end up dating? That's not how Galgame works! Reimu: What are you babbling about? Don't forget to come to my wedding with your brother. Alice: What's wrong, Kaguya? If something's bothering you, tell your sister-in-law. Marisa: Your brother's awesome, hehe. ... [Anyway, you have to be happy... Rin...] ---- P.S. This is a completed million-word novel, so it's guaranteed to have an ending. If you don't like it, come hit me, meow~