グラビテーションEX

Shuichi Shindo and Eiri Yuki fly to New York so Yuki can visit the grave of Yuki Kitazawa, his first love, and they come back to Tokyo with Riku, the boy Kitazawa left behind. Riku moves into the household while Shuichi tries to keep Bad Luck working, and Nittle Grasper's Ryuichi Sakuma keeps circling the couple. This sequel opens straight after the last volume of Gravitation.