Complete 'Sae-entific Hearts' bonus scene.
Complete 'Sae's Day Out' bonus scene.
Finish the game.
Reach Kiyoko's 'good' ending.
Reach Naomi's 'good' ending.
Meet 'Ceri' with either Kiyoko or Naomi.
Finish Act 2.
Finish Act 1.
Go on a 'date' with Naomi.
Meet the two girls.
Join the Science Club!