Lady Carolina, the overlooked daughter of a powerful duke, has always believed herself to be the black sheep amid her illustrious kin. Her father is the distinguished prime minister; her elder sister, a prodigious mage destined to become their nation's next Saint. In comparison, Carolina resigns herself to a quiet existence in their shadows until a sudden and unexpected royal decree alters her destiny, thrusting her into a political marriage with the formidable Bloodthirsty Prince of the neighboring Empire of Malcosias. Determined to prove her worth, Carolina takes a bold step into a world fraught with both political and mortal peril. As royal obligations intertwine with hints of true love and the stirrings of her own latent power, Carolina moves ever closer to understanding what it truly means to be exceptional. (Source: J-Novel Club)

The death of Sheena Totsuki's roommate is casually announced at the start of class, and the day carries on as usual. In an orphanage that raises children as soldiers, death is nothing new to the residents. With their home country embroiled in a war that has dragged on for too many years and shows no signs of stopping, the institution's children are sent off to die in battle every day. In contrast to the other orphans, Sheena is deeply disturbed by the ongoing conflict and wishes for it to end. On the night of her roommate's death, Sheena met a blood-covered girl who remained jubilant despite the condition she was in. The next day, the girl appears as a new student in Sheena's class and introduces herself as Mimi Kagari. Initially thought to be a school myth, Mimi is said to be the secret weapon of the orphanage—a girl who cannot die. Assigned as Sheena's new roommate, Mimi hopes to get along with her and get accustomed to school life. However, unsettled by Mimi's carefree attitude toward the war, Sheena struggles to accept the world they live in, all while their unusual friendship flourishes amid the bleak situation.

Third season of Grand Blue.