Shin Megami Tensei: Devil Survivor/Last Day - Gin's Path

Kudanshita
Haru event (advances time)

Shiba Park
Amane event (advances time)

Suidobashi
Free battle

Shiba Park
Boss battle - Jezebel

Make sure that your strongest team (most likely the main character’s) is equipped with Force property magic (Zandyne, Force Dance), Almighty magic (Holy Dance, Megido) and/or powerful physical attacks (Deathbound, Mighty Hit). If possible, equip a demon with Evil Wave (Dragons) or Chaos Wave (Vile demons).

Each of the other characters should have revival skills. Laksmi (with Samarecarm) is a very helpful demon. Useful passive skills are Endure, Blitzkrieg, Anti-Most and Force Rise/Jump. Anti-Fire/Null Fire are also very useful.

Move the main character straight into the fire and kill the Decarabia. Another character should move to the upright corner and target the Decarabia there. The remaining two move towards Amane to defeat the last Decarabia and to heal Amane whenever her HP display turns yellow. Alternatively, move all of the characters towards Amane. If they stay away from the lake of fire, the Decarabia in the center and top of the screen should ignore them, and will disappear when Amane comes around.

Attack Jezebel with your strongest attacks. Just like Belial, Jezebel attacks 3 times per turn. Most (or even everyone) of your party will die to her attacks (Maragidyne, Judgement, normal attack) when the turn is over. Keep attacking Jezebel with the main character's team and revive them with the other characters.

After taking away around 75% of Jezebels HP, Amane will regain control over her soul and runs away from Jezebel. The summoned copies will only follow after Amane, so ignore them and keep attacking Jezebel. You should be able to kill Jezebel before Amane will be attacked. Otherwise, protect Amane by healing her and fighting the followers. One possible way to handle both alternatives is to hold back the main character and a character with healing spells to attack Jezebel while the remaining two parties protect Amane. There is a chance that Amane will move into an alcove in the rocks and can be blocked in by one of the characters, preventing the copies from getting to her as long as the character survives.

Ikebukuro
Boss battle – Bishamon

In comparison with the two previous fights, this one is quite easy. Bishamon is weak to Ice damage, so prepare Bufudyne as well as Holy Dance / Megido. Once again, Evil Wave and Chaos Wave are helpful, too.

You will most likely not be able to avoid fighting some of the Rangdas that are guarding Bishamon. However, keep targeting Bishamon and kill him with your spells. Physical attacks are possible, as well. This battle should be won in a couple of minutes.

Shinagawa
Boss battle - Zouchou and Koumoku

You will have to fight the two remaining Devas together but it’s still a very easy fight. Zouchou is weak to Force damage and Koumoki to Electricity damage. Exploit their weaknesses with Zandyne and Ziodyne. Physical attacks and Almighty damage works, too. As the other demons have various weaknesses, it’s not bad to have some party members with the other elements around. And again, Evil Wave and Chaos Wave are quite effective.

Zouchou and Koumoku can attack with long range (Evil Wave), as well, but only as long as their supporting demons are alive. You can use Mazandyne / Maziodyne on the Devas and those demons will most likely die in the first or second round already. After defeating them, make use of your own Evil Wave / Chaos Wave to crush the Devas. This battle shouldn’t take very long.

Akasaka
Izuna & Fushimi event (advances time)

Kudanshita
Haru event (advances time)

Roppongi
Boss battle – Belzaboul

Belzaboul is not only strong against all elements, he also drains physical attacks. His range almost covers the whole battlefield and he recovers 200-300 HP after every battle. After some rounds, Belzaboul will turn his demons into Maggots and both will use the skill Spawn which lays eggs that deal high damage when they hatch (and in most cases kill the infected characters) and also result in more Maggots. Luckily, Belzaboul can only attack once per turn.

This sure sounds like a very hard fight, and by all means, it’s not easy. But with an effective strategy and good preparation it’s possible to win.

Make sure, to have as many Almighty magic (Holy Dance, Megido) and Drain users as possible. You should equip high Magic characters with Drain. If your Magnetite bar happens to be full during the battle, copy Drain. It will be the most useful skill in this fight. Sama(Recarm) is important and ailment curing skills (Affection, Amrita) are a good bonus.

Evil Wave / Chaos Wave is not as useful as in the previous fights, as Belzaboul’s range allows him to attack you anyway. Lastly, any MP saving skills (Blood Wine, Tyranny, etc.) and Dual Shadow for Holy Dance / Drain users will ease this battle for you.

Move forward and keep attacking Belzaboul with all you’ve got. Heal and revive whenever it’s possible. And, most importantly, keep draining Belzabouls MP from the start. Without MP he won’t be able to lay any more eggs and the fight becomes even easier. Plus, Drain is probably the most damaging skill besides Holy Dance. Always try to do more damage than he can recover and you will win this battle eventually – even if it could take some time.

Remember that Pierce will bypass the damage limitations (and even the drain on Physical damage), so it's possible to use some more powerful skills against him with a character (or demons) that have Pierce. Also, the Spawn can be cured before the eggs hatch, preventing the damage of hatching as well as the extra Maggots. Finally, the Maggots themselves don't last very long, so they can be safely ignored if the team can keep up with the cures.