Ys: Memories of Celceta/Monsters

Defeating a monster adds an entry in the journal. There are five entries, one quest related and four boss summons, that are missable in a single playthrough. Journal entries carry over in a New Game+. The boss entries can also be obtained from Time Attack, which is unlocked after clearing the game.
 * Duren: Defeat him in the Sword Training quest.
 * Zandabal: First Krell-Emecia boss fight
 * Polestol: Mustrum boss fight
 * Mesarabadi: Bami boss fight
 * Dagbanther: Gadis boss fight