Story about Fate/kaleid liner Prisma Illya 2wei Herz! / Fate/kaleid liner プリズマ☆イリヤ ツヴァイ ヘルツ! / 魔法少女伊莉雅2weiHerz
Based on the Fate/Kaleid Liner Prisma☆Illya 2wei! manga by Hiroshi Hiroyam...
Based on the Fate/Kaleid Liner Prisma☆Illya 2wei! manga by Hiroshi Hiroyama, itself a spin-off of the Fate/stay night erotic visual novel by Type-Moon.