Although Kokoha calls herself [Touka](https://anilist.co/character/288410)'s childhood friend she's more like her abuser. From an early age she teased and harassed Touka even going so far as taking her virginity with a toy when they were young. As Magical Girl Tear Heart she's lazy, uncaring and selfish. She blackmails Touka to become Magical Joshi Daisei Christea to collect S Energy for her to power her spells. Although she promises to wipe everyone's memories of the embarrassing things she forces her to do she never does. Instead she forces her to do increasingly embarrassing things in order to make Touka into her obedient pet.

Based on the erotic game by 4H. 
 
Touka Minamori is a college student at a university in Tokyo. Although she has a model-like style and good looks that turn heads, she is a hard-core loner who is not good at socializing. Then a younger childhood friend, Kokoha, appears in front of her. To her surprise, she turns out to be the magical girl Tearheart. She then invites Touka to join her as a magical girl. But Touka immediately rejects the offer. 
 
"Because I'm a college student......!?" 
 
Despite her refusal, Touka reluctantly accepts to become a "magical college girl" after being pushed aside by Kokoha. During the transformation, she is exposed in the nude, is called a "lascivious woman" on the streets, and is even attacked by the enemy monsters. What is the future of Crystear, the new magical college girl? 
 
Magical girls are out of fashion! The era of the magical college girl with a sexy and erotic body has arrived!