Another lovely summer goes by for Illyasviel von Einzbern. Taking a break from her magical girl duties, she enjoys her time off after collecting the Class Cards with her best friend Miyu Edelfelt. However, her break comes to an abrupt end when she and Miyu are abducted by Rin Toosaka and Luviagelita Edelfelt, while out with her friends. The magical girls learn that their work is far from over, as Clock Tower informs them that the out of control mana thought to have been sealed continues to be dispersing throughout Fuyuki City. After heading to the origin point of the out of control mana, Illya and Miyu are tasked with solving the anomaly. But after casting their spell, Illyasviel discovers that she's split into two people! As this mysterious new form darts off, she can only wonder: what is to come from the existence of her dopplegänger, running amok in the unsuspecting town? [Written by MAL Rewrite]

Based on the Fate/Kaleid Liner Prisma☆Illya 2wei! manga by Hiroshi Hiroyama, which is a spin-off of the Fate/stay night erotic visual novel by Type-Moon.

Waking up to find herself in a parallel version of Fuyuki City, Illyasviel "Illya" von Einzbern is lost and alone. She discovers her home in ruins, with a massive crater lying in the center of her hometown. With snow falling in the middle of summer, confusion consumes the young elementary schooler, who has no knowledge of where her friends or her wand Ruby may be. Making it to the remains of her house, she is suddenly tackled by an amnesiac girl. Wearing a gym uniform as the icy temperature sets in, the mysterious girl has no idea of where she is or why she showed up. However, this stranger, known as Tanaka, apparently has information about the location of Rin Toosaka, Miyu Edelfelt, and the rest of Illya's missing friends. Fleeing from agents of the Ainsworth family⁠—those in control of this parallel realm—where will these two end up, and how will Illya restore the present back to the world she once knew? [Written by MAL Rewrite]

After the accident in which she lost her mother, 16-year-old Tooru moves in with her grandfather, but due to his home being renovated, is unable to continue living with him. Claiming she will find someone to stay with but also fearing the criticism of her family and not wanting to burden any of her friends, Tooru resorts to secretly living on her own in a tent in the woods. One night on her way back from work, she finds her tent buried underneath a landslide. Yuki Souma, the "prince" of her school, and his cousin Shigure Souma, a famous author, stumble across Tooru's situation and invite her to stay with them until her grandfather's home renovations are complete. Upon arriving at the Souma house, Tooru discovers their secret: if a Souma is hugged by someone of the opposite gender, they temporarily transform into one of the animals of the zodiac! However, this strange phenomenon is no laughing matter; rather, it is a terrible curse that holds a dark history. As she continues her journey, meeting more members of the zodiac family, will Tooru's kindhearted yet resilient nature be enough to prepare her for what lies behind the Souma household's doors? [Written by MAL Rewrite]