古雅 幸

The manager of the school athletics club, she is the only person who shows concern for Kamishiro Nao after his ligament tear. She turns down his love confession on the same day as the Koushin Disaster and is found unharmed close to Nao when he awakens in the town ruins. Aside from knowing who Nao is and the memories they spent together, she initially remembers nothing else after the disaster. 

In New Akatsuki town she lives close to Nao in a different apartment complex. She spends her time trying to recover memories of her life before the disaster and cooking for Nara when she comes to stay over for the night.

Her Baroque power allows her to manifest three clones of herself armed with a variety of weapons. If the clones are destroyed, she is assailed by immense pain which can render her incapable of action until she recovers. Controlling her clones is mentally taxing and she is unable to coordinate the clones efficiently the longer the battle drags on.

 In Yachiru and Kamori's routes she accepts Nara's offer to join her in the Gestalt to allow Nao to break away from any lingering attachment to her. 

In her own route, it is revealed she fell in love with Nao as she attempted to reform him after his injury. She confessed to him and he accepted it. The couple then spent the next six months as lovers, it is during this period when Nao cycles to town with Sachi riding behind that they are seen by the despairing Nara who sees them as the emblem of happiness she aspires to. 

When Sachi is caught up in a horrific accident on public transport, her life is saved but she loses her sight, hearing and voice along with all of her limbs except her left arm. Nao visits her repeatedly at her bedside and they find a way to communicate by writing messages on each other's palms with their fingers. On the first anniversary of her love confession, she asks Nao to grant her a merciful death while she can still be happy about their relationship. He grants it but is unable to overcome the guilt from this decision.

With the withdrawal of the alien Gestalt, Nao loses his ability to manifest Sachi. He gets a final chance to say goodbye to the copy and swears he will live on alone in honour of her memory. /