This is the fourth chapter in the game.
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This walkthrough was copied from vgperson's.
Note: Friend guide is on the Gameplay page.
Leave for the new area, Sweet Beach.
Go to the beach proper and talk to Aira.
Talk to the girl on the right side of town.
Go into the fortune teller's to the left and talk to the woman inside.
Go to the pet cafe way on the left of town and talk to the boy inside.
Talk to Haruya by the entrance to the beach.
Talk to Izuchi on the beach.
Ask for more when Izuchi assumes Nanashi isn't influenced by others to get Irregularity?.
Present Irregularity? at the same section.
In part two, call him out with White-Haired Person when he claims he and the girl aren't acquainted.
Answer "Guinea pig and criminal."
Present Potete's Memories to his bluff.
Talk to Akitaka outside the beach entrance.
Talk to Potete on the right side of town.
Go to the beach.
Talk to Izuchi on the right side of town.
Present Hackers' Objective when Izuchi supposes there's a mastermind.
Go to the beach.
Talk to Kirai outside the beach entrance.
Go to the cafe in CocoAlley and talk to Kotora.
Return to Sweet Beach and talk to Tobari on the right side of town.
Return home to Nanashi's bed.
For the objective, choose Hackers' Objective.
For the difference, choose The Other's Goal.
For the identity, choose The Other's Identity.
Talk to Mikado in his room.
Choose Can't Read His Mind?
Go make as many friends as necessary; the max is 44.
When you're done, talk to Misane in Nanashi's room.
This is the point of no return for changing which ending you're getting.
Go outside and check on Miumi.
Go to 307 Tower and take the elevator to the Control Room.
Delete the three sets of viruses along the way and walk to the end.
The Bad Ending requires you make no additional friends (so only the 8 plot ones).
The Normal Ending requires at least 9 friends.
The Happy Ending requires at least 25 friends.