I didn't exactly get that part, or rather what she did after, did she just knock him out or did she remove his memory or something?

yeah she just force punched him to sleep

Was a good way to get some fanservice in while also showing off his "auto-heal" or w/e, so it won't look weird when he gets knocked out later (assuming he will) and just auto-heals himself. xd

been watching this as it comes out it is one awesome anime

Amazed. Thought this was going to be one of the overly hyped anime that ends up not being very good in the end, but so far this is amazing. Definitely going to keep watching this.

I was slightly confused by the end of it as well, pretty sure she just knocked him out. I was surprised, I didn't think she would do anything to her precious onii-sama lol

Episodes are so short though, been watching too many 40 minute+ shows recently I guess

Episode 4 out

need episode 5 now. i like this anime quite a lot

The sister died in the latest chapter btw