Shin Megami Tensei: Devil Survivor/Day Three

Shinjuku
Midori event (advances the clock):

Midori is in Shinjuku continuing to play the part of superhero. In this case, though, the party finds her speaking to a Jack Frost about love. The demon seems interested in the prospect of gaining power through love, and leaves to explore the possibilities.

18:00
At this point all previous events for the day become unavailable, except for free battles and the story battle.

Boss Battle
In preparation for this battle it is probably best to make sure each party has a healer (and the main character's party may want two of them). Even fairly weak healing spells are helpful here, since Beldr has a Vampire Mist attack that will damage everyone (not just a single character and his/her demons, but all of the player's characters and demons).

The main character should have the Devil's Fuge, and will therefore be the only person capable of damaging Beldr (and for this reason should be the only person to attack the demon). Anyone else that finds themselves in a fight with Beldr (including the demons in the main character's party) should Guard or heal, as attacking Beldr will just give him extra turns.

Beldr appears with a number of lesser demons. The other characters should focus on keeping these demons off of the main character, while he goes after Beldr. They should also keep each other (and the main character) healed.

If this battle seems especially hard, use fusion and the auction to gain some better demons and work on being able to take out most of the demons in the free battles in a single round. This should mean that the characters are strong enough to easily handle Beldr's minions while the main character takes on Beldr himself. The Devil's Fuge will probably take several rounds to defeat Beldr, so it is important that the remaining characters can keep the rest of the demons at bay and survive Beldr's Vampire Mist.

Shiba Park
The Free Battle in Shiba Park is still available after completing the story battle.

Shinjuku
??? event (advances the clock):

The mysterious Gigolo is interested in learning about the party's knowledge of the events that have transpired. He tells them a bit about the consequences of having defeated Beldr.

Shibuya
Atsuro & Yuzu event (advances the clock):

This event finishes Day Three for the party.