MIRAI LIGHT NOVEL HardCover VOL 01 
YEN ON
(W/A/CA) Mamoru Hosoda
Little Kun isn't too happy about the latest addition to his family. With the arrival of a new baby sister in the house, he worries his parents may not love him as much as they used to... But when a teenage girl shows up and tells Kun that she is his sister from the future, it may be that there's more to this new relationship than Kun ever could've dreamed!