The collab was announced on the official Twitter for NIKKE.
The Chainsaw Man collaboration will start on the 22nd of February and will probably last for 2-3 weeks. An official PV was also released today and you can check it here.
What characters are coming with the collab? Nothing is confirmed yet, but looking at the official art (and combining this with the leak last week), we can assume we will get three characters with it:
Weapon: Rocket Launcher
Rarity: SR (welfare)
Weapon: Sniper Rifle
All 3 characters are visible on the blog's cover image. Also, we won't be posting their kits on the website as usual - simply because they can change last minute and we don't want to spread misinformation.
To celebrate the collab, a login calendar will start today and last for a week. Here are the rewards available from it: