"Aika Hiiragi is a main character in the manga series ""The Regressor and the Blind Saint"". She is a 17-year-old girl who possesses the ability to see the future, albeit in fragments. Her abilities come at a cost, as she is also afflicted with epilepsy and has a weakened immune system.

Aika is a student at the prestigious Shinyo Academy and is a member of the school's newspaper club. She is known for being a diligent and hardworking student, often pushing herself to the limit to complete her assignments on time. Despite her illness, Aika remains upbeat and optimistic, refusing to let her condition define her.

As the story unfolds, Aika becomes involved with the protagonist, Kento Suga, who has the ability to ""regress"" time. Together, they team up to stop a dangerous cult whose leader seeks to control the world by manipulating time.

Aika proves to be a valuable asset to the team, using her precognitive abilities to anticipate the cult's next move and prevent disasters from occurring. However, her powers come with a price, as she often suffers from seizures and debilitating headaches. Despite this, Aika remains steadfast in her resolve to save the world from the cult's tyranny.

Throughout the series, Aika's relationship with Kento deepens, and they develop feelings for each other. However, their relationship is hindered by the dangers they face and their respective abilities.

In conclusion, Aika Hiiragi is an inspiring and resilient character who faces adversity with bravery and determination. Her precognitive abilities make her a valuable asset to the team, and her unwavering spirit serves as a beacon of hope in the face of danger and uncertainty."