Fathers Letter - You can miss this by not reading Ferdinand's letter BEFORE opening the door

What's wrong Randy? - When in Blue Cat for the first time, check the building with the worried parents and head to the second floor room for an event with Randy.

Elder's Advice - Meet the Elder before leaving Blue Cat for the first time.

Encounter with an unexpected person - Talk to Etoile at the bar during the Cat's Eye Investigation.

You too, Claudia? - Save on Claudia's Rose covered floor, and search until you find the event where she is lost.

Peconyan Love Pendant - Obtain the Love Pendant from Pekonyan before watching the theatre event. Missing this causes you to automatically miss two other Dairy events.

Old Dog - Retrieve Koro from deep inside the Giant Bobo

Extra Berg - Talk to NPC's in Orange who will tell you about Eringa Valley. Fight Berg. Only do-able in Chapter 8.

Clarie and Diary of Etoile - Enter Etoile's house after obtaining the Airship to get these events. Missing these two events will also cause you to miss two additional entries.

Illustration 6: MUST check Kururu's dresser at the very start of Chapter 3. You cannot get it afterwards.

Illustration 7: Talk to the Painter at the top of the stairs in Blue Cat. Return in chapter 8 and he will thank you with this illustration.

Illustration 9: Eringa Town Dungeon.

Illustration 18: Check the dresser in Crowdia's room. You cannot return when Beauty Castle falls.

Illustration 19: Check Mayo's Dresser in her room. You cannot return when Beauty Castle falls.

Illustration 20: Right before the final boss, you are given a password. DO NOT FIGHT THE BOSS and return to The Ancient civilization near Pana cotta. Input the password to obtain this illustration.

Koro - You MUST collect the Old Dog from inside the Bobo in Act 4 and then bring him to Orange Village.

Albatross: In Beauty Castle. You cannot return to Beauty Castle once it falls out of the sky.

Kid: Ice Dungeon. You cannot return to the Ice Dungeon after chapter 8.

Flare and Adult Flare: In Chapter 8, you must talk to people in MotherGreen's Fish Restaurant to unlock the village of Red Hot. Take a Quiz twice to obtain both puppets. You cannot get these puppets after chapter 8, since you can miss getting Red Hot as a Location.

Night Spawn - Obtain all Observations and report to the Principal.

Lightium - Defeat Berg in Elinga Village and talk to one of the NPC's there.

Greentium 20 - Subspace Castle