Just noticed just how much this reminds me of Eromanga sensei. Brocon imouto that's a shut-in, siscon ani who does a lot to support his adopted little sister and the successful senpai that's short, blonde and has drills for hair.
Asahi as of this moment hasn't tried to get rid of manga, books and games that the club owns so I can't even say she's better considering she's been more of an annoyance than her which is a feat and a half. Her rivalry thing was endearing 2 chapters ago, but throwing belongings of others is a...