Square Enix’s mobile RPG Valkyrie Anatomia -The Origin- (ヴァルキリーアナトミア -ジ・オリジン) is now having a collaboration event with the developer’s PS4/PC title NieR:Automata. 2B from NieR is featured as a limited edition character in this event.
All players are given a ★6 weapon "白の契約：レプリカ", which can be equipped by all characters but is only the strongest when equipped by YoRha Type B. Other limited edition weapons are "★6 神剣モノマキア" and "★5 雷杖パパガロフ".
▼ "★6 白の契約：レプリカ"
▼ "★6 神剣モノマキア"
▼ "★5 雷杖パパガロフ"
Some players actually demonstrated how to find the quest and get 2B on YouTube. You may want to watch one of those since it tells you what to do step by step. Hope you find this helpful!
I don’t find that quest order “自動人型步兵”(?)
The quest is called "自動人型步兵".
Which quest in order
You have to clear the event quest in order to get 2B.
How to get 2B?