A doctor and his recently-deceased patient are reborn as twins to a famous Japanese musical idol and navigate the highs and lows of the Japanese entertainment industry as they grow up together through their lives.

A team of assassins exacts a bloody retribution on Joe Logan – a former ninja who escaped his clan – and his family for betraying their ancient code. Rising from his seeming "death," Joe will re-emerge as his former self – Ninja Kamui – to avenge his family and friends and bring down the very clan that made him.

In Fujisawa, Sakuta Azusagawa is in his second year of high school. Blissful days with his girlfriend and upperclassman, Mai Sakurajima, are interrupted by the appearance of his first crush, Shoko Makinohara.