Koi no Tsubomi has sold 249 000 copies. BLUE BIRD has zero chance of beating it's steady sales during the 4th, 5th and sixth week, so maybe BLUE BIRD might sell less. Koi no Tsubomi had 15 000, 11 000, and 11 000 for the 4th, 5th and 6th week. That's really hard to beat.
