September: Secret Laboratory

Persona 4 Golden guide · Naoto's dungeon and school trip

September features the class school trip to Tatsumi Port Island followed immediately by Naoto Shirogane's disappearance into the TV world. Players must investigate her whereabouts in Inaba to unlock the Secret Laboratory dungeon and rescue her before a prolonged period of fog.

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King's Game during the school trip | On September 9, choose to stay and participate in the King's Game event rather than leaving to avoid missing unique story scenes and character interactions.School trip souvenir | On September 10 at Port Island Station, speak to the vendor or shop carefully before leaving the trip to acquire limited souvenir items.

Deadlines

October 5 | Clear the Secret Laboratory dungeon to rescue Naoto Shirogane before the fog sets in.

Social links

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Rise Kujikawa (Lovers): Available on free days during the afternoon; advancing her rank unlocks valuable navigation support skills for the Secret Laboratory.Kanji Tatsumi (Emperor): Available on designated school days and non-rainy days; advancing his link increases his combat viability for upcoming physical/electric dungeon battles.

Worth doing

Complete the prerequisite investigation between September 17 and September 21 by speaking to the officer in the Shopping District, the girl in Junes, and the officer at the Riverbed to unlock the dungeon.
Read books or fish during rainy evenings in late September when outdoor Social Links are unavailable.

Items

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Research Card: Chest on B4F of the Secret LaboratoryLeader Card: Defeat the sub-boss on B6F of the Secret Laboratory

Secrets

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Returning to the Secret Laboratory after October 6 lets you access B9F to fight the optional boss, Extreme Vessel, which rewards a weapon for Naoto and courage stats.

Enemies

Dominator

Weak to Electric

Hits hard with physical attacks and high agility.

Mighty Beast

Weak to Wind

Absorbs physical attacks, requiring heavy elemental magic.

Shadow Naoto

Weak to Fire

Shifts resistances with Element Zero and inflicts ailments alongside Mudo and Hama spells.

Shops and people

Shiroku Clinic: Sells upgraded medical supplies, revival items, and status-clearing consumables suitable for status-heavy dungeon floors.

Tips

Bring Personas that resist or nullify Hama (Light) and Mudo (Dark) skills, as Shadow Naoto and several high-floor laboratory shadows frequently cast instant-kill spells.
Stock up on Patra items or equip ailment-nullifying accessories, as enemies in the lower laboratory floors frequently inflict Confusion and Silence.

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Stats and Social Qualities

October: Secret Laboratory

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