Where's the link to buy?

Also, whats the artist/circle name?

Base +25, Coledas Ukgent +18

[こさぎりずむ] 僕をいじめから救い出そうとしてくれた女の子がいじめっこに寝取られた話
https://www.dlsite.com/maniax/work/=/product_id/RJ01156743

Base +15, Coledas Ukgent +18, nuts987 +13

The story of how the girl who tried to save me from bullying ended up being seduced by the bully

Fukumi was bullied by Onitake almost every day at school.

Then one day, a girl who cared about Fukumi appeared.
She was Nakano Yori, a serious and quiet beautiful girl.

However, Onitake could not overlook this and attacked Yori.

Yori resisted, so Onitake gave her two choices:
either escalate the bullying of Fukumi or become Onitake's sex slave .
In order to protect her boyfriend, Yori agreed to his demands, but...

Base +25, Coledas Ukgent +18, Show9060 -9

这个发型。。。我认得你！你是雷影！

Base +6, steny850408 +6