Kashimashi ~Girl Meets Girl~

Synopsis: 

Hazumu's friends have always considered him "almost like a girl." But what happens when it becomes literal? After being rejected by the girl he likes, Hazumu goes for a walk in the woods, where an alien spaceship accidentally crash-lands on top of him. To honor the galactic code, the aliens restore Hazumu's life—but have reversed his gender by mistake! Now Hazumu must live the rest of her life as a girl, while the aliens move into her house and follow her around. The unexpected sex change is affecting Hazumu's friends, too: Asuna, who rejected Hazumu as a boy, suddenly confesses her love, while childhood friend Tomari starts to show signs of jealousy. Even Hazumu's best friend Asuta questions his feelings. And when Hazumu learns the reason for Asuna's odd behavior, it could be the turning point for the two of them...