CAL III: Kanketsuhen

Two years have passed since Wataru Ishibashi, an ordinary high-school student in modern-day Japan, visited the magic world of beautiful goddesses and rescued his girlfriend Mika. It seems he can now finally enjoy a peaceful time with his beloved girl. But one day, his old friend Ches, a cute cat-like fairy girl, appears in his room and summons him to the world of gods. It appears that Venus, the goddess of love, is in trouble. Looks like Wataru is about to begin another adventure in the world of gods!

[From Moby Games]