Imouto de Ikou!

Life for high school student Haruki is already complicated enough, navigating the usual adolescent turmoil alongside his precocious little sister, but things take an interstellar turn when a mysterious spacecraft crash-lands nearby. This isn't your typical alien invasion, however; the extraterrestrial visitors have a peculiar mission that quickly entangles Haruki and his sister in a whirlwind of cosmic confusion and unexpected desires. Prepare for a comedic odyssey that redefines sibling bonds and the very meaning of "family." As more bizarre characters descend upon their small town, Haruki finds himself at the center of a rapidly escalating, decidedly adult, alien-influenced harem. With slapstick humor and out-of-this-world antics, this series explores the wild side of growing up, where coming of age collides with close encounters of the risqué kind. It’s a journey into uncharted territory, both personal and planetary, that promises plenty of laughs and even more blushes.

✦ AI-drafted summary