Natsu no Arashi!: Akinai-chuu

A young man remains caught between childhood and adulthood as he continues to interact with the spirit of a woman from World War 2. Alongside other female ghosts from the same era, they engage in shared adventures, deepening their understanding of one another through a supernatural bond that allows time travel. He grapples with his growing feelings for the ghost, while a contemporary friend, who disguises herself as a boy, also vies for his affection.