Harukanaru Toki no Naka de 5

The protagonist and her childhood pals prepare for their Christmas vacation in the year 2020. They are dragged into the parallel universe as they board a flight to return to Japan. In December 1863, the world saw the Tokugawa shogunate’s chaotic end acquire the uneven capacity to travel to both realms using a magical hourglass. Although she and her companions enter and exit the parallel universe, her adventures in this realm last three years. Initially, the protagonist wishes to save the suffering Four Gods from the warring factions of the parallel universe to save her inexplicably destroyed home world. As time passes, she discovers that both realms are blended to form a new universe. She deliberately sacrifices parts of her own life force to safeguard those dear to her to prevent the violent deaths of two planets.