Akikan!

In a typical high school setting, Kakeru Daichi's life takes an unexpected turn when a can of melon juice soda he purchased from a vending machine suddenly transforms into a beautiful and enigmatic girl, whom he dubs "Melon." As more "Akikan" girls, who are essentially empty cans, appear, Kakeru discovers that these beings require a unique and intimate connection with their human counterparts to sustain life: they must be infused with carbon dioxide through a kiss. This peculiar and intriguing premise sets the stage for a captivating story that explores the complexities of relationships, the human condition, and the boundaries between life and death.