Duet Night Abyss moves character acquisition away from random pulls and into clear, repeatable systems. You’ll build your roster through the in-game Secret Letter system, time-limited launch events with guaranteed claims, and farmable routes that also cover weapons. If you’re just starting, install the game from the official site at duetnightabyss.herogame.com and plan your first week around the free claims listed below.

Duet Night Abyss character unlock methods (overview)

Method What it yields Notes
Secret Letter system Targeted character unlocks Core path for recruiting characters without random pulls.
Launch event rewards Guaranteed free characters and gear Includes Berenica, Rebecca, Outsider, Daphne & Lisbell, Truffle, and Filbert.
Farming (repeatable activities) Characters and signature weapons Psyche Fina and their weapon are explicitly farmable at launch.
Event modes Progress items, claims, materials Watch for the Immersive Theatre event track during launch.

Secret Letter system (character unlocks)

The Secret Letter system is the backbone of character recruitment. Instead of pulling on banners, you progress specific characters through in-game objectives tied to Letters and then unlock them directly. This is a deterministic path: set your target, complete the required steps, and claim the character when the track is finished.

What to do next:

  • Open the character acquisition menu in-game and select the Secret Letter track for the character you want.
  • Follow the listed objectives; they can include event tasks and routine play activities.
  • Redeem the track when it’s complete to add the character to your roster.

Tip: Plan Secret Letter progress in parallel with launch events so the same playtime advances both.

Free launch characters and where they come from

At launch, several characters are guaranteed through event tracks and claims. If you’re starting fresh, prioritize these before chasing longer grinds.

Character How it’s obtained at launch
Berenica Free via launch events (claim track)
Rebecca Free via launch events (claim track)
Outsider Free via launch events
Daphne & Lisbell Free via launch events
Truffle Free via launch events
Filbert Free via launch events
Psyche Fina Farmable route at launch (includes weapon path)

Note: Event tabs can change during the launch window. Look for tracks labeled with launch rewards or highlighted event banners such as Immersive Theatre.

Farming characters and weapons (no gacha)

Character and weapon acquisition is designed to be earned by playing. Repeatable activities and event tracks can unlock both units and their signature gear. A clear example at launch is Psyche Fina, who has an explicit farm route alongside a farmable weapon track.

  • Set the target in the relevant menu so your activity advances the correct track.
  • Use event periods to accelerate progress; launch events typically include generous milestones.
  • Check for weapon-specific tracks tied to the same character so you don’t split progression across two targets unintentionally.

Progression without gacha or stamina gates

Duet Night Abyss removes traditional gacha and stamina systems. Characters and weapons are obtainable by completing objective tracks and participating in events, so your time investment directly maps to unlocks rather than roll odds or energy timers. This also means launch events are high-value windows: the more tracks you clear early, the faster your roster stabilizes.

Pick your freebies wisely (elements, weapons, roles)

If you’re choosing between guaranteed launch claims, it helps to balance elements, weapon types, and team roles. The game’s characters cover four elements, a small set of weapon proficiencies, and distinct combat roles.

Category Options
Elements Pyro, Anemo, Hydro, Lumino
Weapon proficiencies Sword, Dual Pistols, Whipsword, Assault Rifle
Team roles DPS, Support, Control, Heal

A balanced early roster typically pairs one primary DPS with either a Control or Heal unit and fills the third slot based on the content you’re clearing that day. Use the free launch characters to cover missing roles or weapon types you prefer to play.

Fast start checklist (day one to week one)

  • Install and launch the game from the official site once it’s available in your region.
  • Clear the tutorial and open the Events section; claim any day-one launch rewards.
  • Activate the Secret Letter track for your top-priority character so normal play counts immediately.
  • Enter the highlighted launch event tabs (including Immersive Theatre) and complete their milestone tasks.
  • Route your repeatable farming to targets that advance both your character and weapon goals (e.g., Psyche Fina and their weapon).

In short. You earn characters by playing, not by rolling. Set a target in the Secret Letter system, clear the launch event claims for guaranteed units, and keep your farming focused. With a few days of consistent play, you’ll have a functioning trio without spending or waiting on energy timers.