It didn't touch the apocalypse yet... It should be around chapter 30-ies. But in Tapas, its around 20-ies
Planning to try to get to the apocalypse before new year. But there is a part where:
Spoiler
MC looks through the older sister's (who experienced the apocalypse, died and then rebirth back to the past) memories
Also, thanks @silverraven0 for recommending!