NOTE: If you are familiar with school mode from the first Danganronpa game: Most of this will be just a review for you. Everything from trip tickets to Trigger Happy Heart (although it's called Shot Through the Heart) is the same and you only need to refer to the chart at the bottom. Keep in mind that you still need to get all hope fragments  ( Mr. Congeniality) and complete all concepts in a single playthrough if you want to see a single island mode ending. Since you cannot actually get a character ending in island mode on your first playthrough, It is recommended that you spend your first island mode playthrough getting all hope fragments and gathering enough materials to make Cheat Sheets and Cleaning Maestros. Don't worry about building anything for Usami as your characters will be too low leveled to complete most tasks. Spend your second playthrough cleaning up any hope fragments and trying to build all concepts to earn island mode endings for this trophy.

Island mode is an extra mode that is unlocked after completing the game for the first time. This mode works very differently from the base game. In island mode: no killings take place. Instead, you are assigned to complete tasks over the course of 50 days that involves constructing models for Usami to keeping the island cleaned up. Most of the basics of this mode are explained when you first start it. Keeping a second save file is also recommended so you can back up to it in case you mess up.

Over the 50 days of island mode, you can build relationships during free time using trip tickets with other characters. You can earn an ending as soon as you have maxed out your relationship with them. Just talk to Usami to see the progress of your relationships. Usami tracks your relationships by amount of hearts (You need 10 for an ending). The amount of hearts you earn varies between +0.25, +0.5 and +1 hearts. There are a total of 15 different endings for island mode (one for each character excluding Hajime). When your relationship is maxed out, you talk to them on day 51 and they'll give you a present of their favorite undergarments. With good timing and good luck, You can earn up to 5 island mode endings in one playthrough.

Relationships can also be raised through a random occurring event known as Shot Through the Heart. This event will not occur with characters missing any hope fragments. Since you need them to earn island mode endings in the first place, It's important to get that done. In Shot Through the Heart, Hajime tries to read the inner thoughts of his classmates and can agree (affirmation) or disagree (negation) with their thoughts. It works similar to class trials where you shoot a statement with one of your truth bullets, but there are some things to be noted about it:
 

• Take your time. It's unlimited.
• It occurs randomly when you use a trip ticket.
• It's always the same.
• There are no right or wrong answers. Anything goes here. There are better answers that help your relationship with the character grow faster.

Here is a chart for the best possible results (+1 heart) for each character:

Character	Best Place	Best Responses	Shot Through the Heart	Ending Answer
Nagito Komeada	Beach	Let’s make a sand castle! I guess we could go fishing. Let’s split a watermelon.	Shoot negation bullet at "hate me."	Bad Luck.
Gundham Tanaka	Library	I should probably read some technical books… This place is dangerous… This is a great place to kill time.	Shoot affirmation bullet at "have this island under his control..."	You've become more atrocious.
Kazuichi Soda	Millitary Base	Let’s ride the tanks. This is pretty exciting. Let’s look for fuel.	Shoot negation bullet at "too abnormal"	Make a rocket ship.
Byakuya Togami	Library	All right, let’s look for treasure! That’s a lot of books. Shall we study?	Shoot affirmation bullet at "stand with me?"	An imposter.
Teruteru Hanamura	Beach	Let’s take our clothes off. Let’s fish! Let’s drop some coconuts.	Shoot affirmation bullet at "Has that quality..."	Diner.
Nekomaru Nidai	Jabberwock Park	All right, let’s go running. All right, let’s pick up the litter. Speaking of parks, the bathroom…	Shoot negation bullet at "doesn't trust me..."	Hope.
Fuyuhiko Kuzuryu	Movie Theater	A yakuza film, huh… We need to have popcorn. 3D, huh...	Shoot negation bullet at "waste of time."	Courage.
Akane Owari	Beach	Let’s go fishing. Let’s look for crabs. Let’s go swimming!	Shoot affirmation bullet at "There's nothing more important than food!"	To gather hope fragments.
Chiaki Nanami	Jabberwock Park	This looks like a great spot for napping. Let’s sit down for now. If we break that statue…	Shoot negation bullet at "disappointed"	Dating sims.
Sonia Nevermind	Jabberwock Park	How about some tree climbing? The scenery is so nice… If we move that statue…	Shoot negation bullet at "decide for me?"	Makango.
Hiyoko Saionji	Amusment Park	This place looks like fun. Let’s go inside the haunted house. Let’s climb that castle.	Shoot negation bullet at "hate me."	Father.
Mahiru Koizumi	Jabberwock Park	There’s no one here. What a weird statue. Let’s climb that statue.	Shoot negation bullet at "all I can do is take photos."	About your camera.
Mikan Tsumiki	Jabberwock Park	The sky is blue. There’s a nice breeze. Why don't we take a walk?	Shoot negation bullet at "doesn't care about me..."	Propose.
Ibuki Mioda	Library	I’m bored. All right, time for some hide-and-seek. Where’s the CD corner?	Shoot affirmation bullet at "aren't strangers anymore"	Band members.
Peko Pekoyama	Amusment Park	This place looks fun. Let’s ride the carousel. Let’s climb that castle.	Shoot affirmation bullet at "waiting for an opening"	It's friendship.