A full walkthrough and guide for the In Defense of Tokyo sidequest in Shin Megami Tensei V (SMT 5). Read on to figure out where to find the sidequest, how to complete it, and what rewards you can receive.

In Defense of Tokyo Location

The quest-giver is a Futsunushi located just south of the Ueno Park Leyline Fount. You can get to this location from the Ueno Leyline Fount by going north, then circling back down southwest.

In Defense of Tokyo Sidequest Information

How to Complete In Defense of Tokyo

Objectives
1	Talk to Futsunushi south of the Ueno Park Leyline Fount. Accept his quest to get rid of Adramelech.
2	Adramelech can be found next to the Umayabashi Leyline Fount, far southwest of the Ueno Leyline Fount.
3	Talk to Adramelech. To continue the quest, select Fulfill Futsunushi's request. Note: You can select Talk to him to listen to Adramelech's point of view. Accepting Adramelech's quest The Raid on Tokyo will let you fail In Defense of Tokyo. You can reject Adramelech's quest to continue Futsunushi's route.
4	You will enter into a battle with Adramelech. Defeat Adramelech to fulfill the quest objective. ・How to Beat Adramelech
5	Return to Futsunushi to complete the quest. You will receive 2 Strength Balm and 62000 EXP as quest rewards. Also, Futsunushi will join your party.

How to Beat Adramelech

Hit Adramelech with Ice

Adramelech is weak to Ice, so use Bufu skills to extend your turns, then switch back to Physical attacks to conserve MP.

Create a Party full of Fire-Blockers

Demons like Throne and Cerberus will do well to block Fire attacks, so Adramelech loses turns.

Full Guide:
How to Beat Adramelech

Should I Choose Futsunushi or Adramelech?

Do You Need Fire or Physical?

Adramelech has an extremely powerful Agi spell, Agibarion, which does Severe Fire damage. Futsunushi has the extremely powerful Physical skill, Catastrohpe, which does Severe Physical damage. Choose whichever skill you need more in your party setup.

Choose Futsunushi for Upcoming Bosses

Adramelech will be less useful in the upcoming boss battles with Odin and Vasuki since they both cast Ice magic, which Adramelech is weak against.

Futsunushi will not be weak to any of the attacks from the upcoming bosses.

Shin Megami Tensei V Related Guides

List of Subquests and Rewards

Vengeance Subquests

Subquests
Prince of Her Dreams	In Pursuit of Knowledge
Brawny Ambitions	She Who Rules the Night
Knocking on Death's Door	Beastly Battle of Wits
Home Sweet Home	To New Horizons
Picture-Perfect Debut	Essential Research
Brawny Ambitions II	Infiltrate the Demon Feast
Tough Love	Pixie on the Case
As God Wills	A Self of My Own
Part-Time Gasser	Lighting the Way
Reclaim the Golden Stool	Liberate the Golden Stool
A Star is Born	Shinjuku Jewel Hunt
The Disgraced Bird God	The Vampire in Black
The Hunter in White	Alice's Wonderland
Devotion to Order	Heroes of Heaven and Earth
The Serpent King	The Great Adversary
Supersonic Racing	Classified Courier
Song of Nostalgia	Guide to the Lost
Rite of Resurrection	Heroes of the Celts
The Guardian of Light

List of SMTV Vengeance Subquests

Da'at: Minato

Subquests
A Preta Predicament	No Stone Unturned
Bully Breaker	Pollution Panic
The Spirit of Love	The Water Nymph
The Cursed Mermaids	The Demon of the Spring
To Cure a Curse	The Gold Dragon's Arrival
The Benevolent One	The Ultimate Omelette
Talisman Hunt	Movin' on Up
Keeper of the West	The Succession of Ra

Da'at: Shinagawa

Subquests
Chakra Drop Chomp	Those Seeking Sanctuary
Holding the Line	A Wish for a Fish
Magic from the East	Can I Keep Them?
Iced Out	Kumbhanda's Bottle
Birds of a Feather	The Tyrant of Tennozu
The Root of the Problem	A Goddess Stolen
The One I Love	The Falcon's Head
Keeper of the South

Da'at: Chiyoda

Subquests
The Path to Myojin Forest	Lighting the Way
Black Frost Strikes Back	A Sobering Standoff
Stones of Malice	One Mokoi's Trash...
He of a Hundred Hands	An Unusual Forecast
A Power Beyond Control	The Search for Oyamatsumi
Clash with the Kunitsukami	The Horn of Plenty
Roar of Hatred	Glitter in Ginza
The Angel of Destruction	The Ancient Guardian
Keeper of the East

Da'at: Taito

Subquests
On Bended Knees	Downtown Rock 'n Roll
The Egyptians' Fate	A Princess in a Pickle
In Defense of Tokyo	The Raid on Tokyo
A Need for Nectar	Abaddon's Assault
Keeper of the North	The Bull God's Lineage
An Incentive for Incense	The Destined Leader
The Holy Ring	The Sleeping Sands
The Winged Sun	Fionn's Resolve
A Universe in Peril

Empyrean

Subquests
The Seraph's Return	The Red Dragon's Invitation
The Noble Queen	The Wrathful Queen
The Compassionate Queen	A Plot Revealed

DLC Quests

DLC Subquests
A Goddess in Training	The Doctor's Last Wish
The Rage of a Queen	Return of the True Demon
Sakura Cinders of the East	Holy Will and Profane Dissent