サナギの心臓, The Chrysalis Heart, Sanagi no Shinzou

This is the Demon World. Meitarou, the legitimate successor to the Demon King, accidentally summons a human girl to the Demon World. Naming the girl "Bibi," Meitarou begins to provide her with various forms of care and gifts... The original oneshot was a huge sensation! Akari Kajimoto, the creator of "Even If Your Mouth Is Slit," draws a story of devoted yet twisted love.