Julius, a mediocre villager, had a strange dream on the day of his eighth birthday. In that dream he saw the life a swordsman living a different kind of life from him. The swordsman had continued to swing his sword day after the day with the hope of being able to slash the stars twinkling in the sky.

This is the story of a swordsman who inherited the memory of an infamous man who was called “Sword Demon” in a certain world.

“——— I want to cut the stars”

In order to protect the girl Yuuhi Katagiri, a new transfer student, ...from danger, Junichi Nagase is forced to kiss her. Not understanding what happend, she screams at him, not knowing that her father has arranged for her to marry him

Yuuki Ashikaga is a high-school freshman at Sakakino Academy. While working as a student librarian, he grows enamored of Kotonoha Katsura, a girl who frequents the library. Unfortunately, Kotonoha is already dating Makoto Itou, another schoolmate.

The situation is further complicated when Chie, Yuuki's older sister introduces him to Roka Kitsuregawa, her kouhai in the basketball club. Roka becomes interested in Yuuki, who only has eyes for Kotonoha. In order to make him jealous, Roka lies and claims she already has a boyfriend, her former classmate Makoto Itou. Unfortunately for all of them, Roka's lie sets off a chain of events no one could have predicted...

Note: Cross Days takes place in the middle of the original School Days storyline and provides an alternate take on how things might have turned out.