Ryuusei Okada

The protagonist of this story. A normal high school student who has the privilege of having the girl with the largest breasts in the world as his classmate. A breast lover his one pleasure in his otherwise boring high school life is sneaking looks at Okis breasts. Katagiri noticing this moves to block his view much to his chagrin. This begins the battle of wits between Okadas attempting to sneak glances at Okis breasts as Katagiri prevents him from doing so.