rosy bitterling (Rhodeus ocellatus)

rose (color) / (figuratively) bright, optimistic (future)

波動関数: wavefunction

沐猴にして冠す: Being a person who is not suitable for the status.

間接話法: reported speech, indirect speech

薔薇園: rose-garden

肋骨, あばら骨: a rib / 肋骨, あばら骨: (of a ship) a frame

"separate stomach": appetite or ability to continue eating after a meal; a hollow leg / "separate belly": in reference to siblings who share the same father but have different mothers

松原: a surname

灰原: a surname