Hiroshi Kuroki

His affinity for astronomy matched only by his infatuation with Aoi, Kuroki is brainy and boasts abundant academic capability. Given his awkwardness in approaching Aoi with the weekend planetarium invitation, it is not that preposterous to speculate (after taking into account individual development) that Kuroki's academic prowess is slightly overemphasized at the expense of his social development. Not suprisingly, Kuroki would love to be involved with the space program in some capacity when he grows up. Ultimately, Aoi decides to break up with Kuroki to spend time with Kaoru and chase after Minamoto.

(Source: Wikipedia)