SWORD ART ONLINE: FATAL BULLET
63 Achievements
1,240
110-140h
Best Friends Forever
Reach affinity level 4 with all friends (excluding additional characters).
70
1.25%
How to unlock the Best Friends Forever achievement in SWORD ART ONLINE: FATAL BULLET - Definitive Guide
Arf-sys
Bazalt Joe
Itsuki
Kureha
Zeliska
These just get to level 4 and then switch them out.
Kirito
Asuna
Leafa
Sinon
Lizbeth
Silica
Yuuki
Agil
Argo
Klein
Yui
Philia
Premiere
Rain
Strea
These characters and not needed to get this achievement.
LLENN
Pitohui
Fukaziroh
M
The best way, is killing enemies and doing quests, finding a good spot to farm stronger enemies is always better. Make sure to interact with them all so no green bubbles are on the map.
I encountered a new item in the game during the latest patch.
It's called Nostalgic Echo and it should be available at Argo's Intel!
I am still missing Yuuki, Argo and Agil and after that I should unlock it. But I thought of letting you all know that this process can be sped up.
If you cannot find it, try buying it in extreme mode (that's the mode where I bought it since I keep playing extreme).
I do not know by how much it speeds up but I can notice this however. Should someone find the exact % for every action let me know and I'll update it!
Update 1: You do not need to get them to 25%. Just popped for me :)
MISSABLE
You will need to reach level 4 affinity with the main Sword Art Online cast and the new characters specific to this game and, as the description says, characters included in updates and DLC, such as the AGGO characters (LLENN, Fukaziroh, Pitohui and M) and DLC (such as Alice, Dyne and Yuna) don't count towards this trophy. You gain affinity with characters by bringing them with you on missions and reviving them.
You can use the method stated in Top Dog to combine gaining affinity, bounty and EXP at the same time. You can also buy the Nostalgia item off Argo to increase affinity gained, it costs 5 million credits. When you have each character's affinity up to level 4, you will also unlock the ability to have sleepovers with them but keep in mind that there are some characters you cannot have sleepovers with unless you are playing in Kirito Mode, with the list being found in That's Kirito for You; you will also need to increase the affinity of the following characters to Level 4 - 75% in order to secure your route to the true ending.
- ArFA-sys
- Kureha
- Zeliska
- Itsuki
- Bazalt Joe
Whenever you reach affinity level 4 with any character, you can easily switch them out by pressing and going to Community -> Friend List, and then press when highlighting which characters you want to switch in or out as you keep track of which ones you've already maxed out their affinity with.
Affinity with friends increases with every action you take in battle, the largest gain coming from reviving them when they die. Make sure you purchase the Nostalgic Echo weapon art after beating the game once and using Rewind Time, as this will greatly increase the affinity gained. One of the most recent patches to the game (I believe from August 2018) added affinity boosting items you can give your friends as well that drop post-game, but the method below will still be the bulk of your affinity gains. I personally got this done while working on "Top Dog" but if you want it done even quicker, the revive method below is great for this.