A member of St. Aile’s SORD team. Sylvie and Vel are third years, and therefore upperclassmen to Gumi and the others; as older students, they are allowed to wear nuns' habits instead of regular uniforms. Works as a pair with Velvet during missions.

Several years after The Fruit of Grisaia... 
 
What was once "Mihama Academy," a sanctuary for young girls, has now been transformed into a SORD (Special Organization for Research & Development) training school dedicated to fostering talent for national defense. Rena and Maki specialize in firearms, Tohka and Gumi excel at sniping, Chris handles explosives and data processing, and Murasaki is a skilled ninja for intelligence operations. Together, they take on cases too complex for the police or Self-Defense Forces, repeatedly facing dangerous missions. This is the story of these young girls, painted in blood and gunpowder. 
 
(Source: Crunchyroll)

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While Rena and Maki recover from their injuries, the other SORD members jet off overseas for a school trip. Within moments of their arrival, though, the Mihama gang are pulled into a manhunt for a SORD deserter, assisted by student Sylvia and Velvet of St. Aile's International School. Tohka's the star of the show this time round, but she's wrestling with her own issues - old memories of her parents, and a promise to a friend that she wasn't able to keep... 

(Source: Frontwing)