Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 8 - SS: Arisa and The Devil Box

She fought in the Battle of Changping and witnessed the killing of hundreds of thousands. She once led the Qin Iron Calvary and battled against the Six Kingdoms. She has seen a third of the land and witnessed the breaking of mountains and rivers. The sound of a grand zither and the light of a great female emperor. A prosperous world that was forged on the battlefield. Yet, these two thousand years are forgotten from history.

- Description from Novelupdates

The mortal body, metamorphosis, longevity, immortality, and eternal life. These five realms, step by step, reveal themselves in front of you. As a normal person, how can one try step by step to reach and open the door to eternal life?

Between the heaven and the earth lies the mortal body, the mysteries of metamorphosis, freedom of longevity, the power of immortality, and the hope of eternal life. A story filled with endless new magic, a new world of immortal styles, people, demons, gods, fairies, magic, kings and emperors. A world of love and hatred, revenge, and mystical battle, all in “Eternal Life.”

- Description from Novelupdates

A princess's duty is to be beautiful, quiet, not loud, to be seen and not to be heard, which was how Dahlia lived most of her life. Bound by the expectations of her title, she spent years trying to prove to her father that she was more than just a princess and capable of being more than an ornament in his court but each time she never got the chance. Instead, she was forced into a marriage of convenience with the bravest knight in all the kingdom, Reagan Hawthorne.Dahlia thought she would use this marriage to escape the brutal crutches of her father and glide out of her cage but Reagan’s cold disdain was an unexpected prison of its own. While he waged wars on distant lands, she stayed behind, holding his household together and protecting the people he seemed to ignore. But Dahlia carried a dangerous secret. By day, she was the perfect wife. By night, she became the “Black Knight,” a masked vigilante fighting for justice in the shadows.Reagan returned, ready to focus on his personal mission: avenging his father’s death. To him, Dahlia was just another pawn in his plans—a spoiled princess he needed to tolerate. But as cracks began to form in her perfect façade, Reagan couldn’t shake the feeling that there was more to his wife than met the eye.Now, with enemies circling closer and their secrets threatening to collide, Dahlia and Reagan must confront the lies they’ve told themselves and each other. But when masks fall and truths are revealed, will their fragile bond withstand the storm—or will it shatter beyond repair?One wound. One secret. One night that changes everything.

High school student Misumi Makoto is called into a fantasy world by the god Tsukuyomi, in order to be a hero. However, the Goddess ruling the world isn’t as thrilled to have him there, and kicks him to the edge of the world. Tsukuyomi declares that Makoto is free to find his own way after Makoto is abandoned by the other Goddess.