Demon Slayer: You Messed with Mitsuri? Better Find a Window to Jump Out Of

[Apologies for the original character + big sister Mitsuri + no CP + no transmigration and no System + everyone survives, HE ending]

Kantsuji Kancheru is Mitsuri Kanroji's older sister, and she regards Mitsuri as the most precious treasure in the world. She's a total doting older sister. That is, until Kantsuji Kancheru left on a trip and her younger sister joined the Demon Slayer Corps. Kantsuji Kancheru was frustrated by her sister's lack of ambition, but joined the Demon Slayer Corps with her anyway. After some time, Kantsuji Kancheru became the Ice Hashira, and not long afterward, Mitsuri Kanroji became the Love Hashira.

What kind of story will unfold next? Stay tuned! (Go read the main story. I'm really too lazy to write a blurb.)

Kantsuji Kancheru: "You damn snake demon! How dare you disguise yourself as the Serpent Hashira and fall in love with my sister! Take this!"

Mitsuri Kanroji: "No, sister!"

Kantsuji Kancheru: "My sister is actually defending you...! Now you're even more dead! Die! (╬•̀皿•́)"