My Best Friend♂ Confessed to Me in a Dating Sim

Why won't you try for an ending with me? One tiny freakout brings best friends Aoi and Ritsuki smack dab into the middle of the world of a dating sim. All this time, Aoi has been trying to act like a cool guy who doesn't care about love, but now that his cover is blown, is this his chance to complete a romance route just for him? And why is Ritsuki's affection meter looking like that? (Source: Futekiya) Note: Includes one extra chapter.