I Know Everything ~Until I am FemCorruption Trained by my Troubled Longtime Friend~
Description
A story about being mating press creampied by a yandere-type longtime friend whose love for you has become warped.
**Official Translations:** [English](https://www.dlsite.com/girls/work/=/product_id/RJ01520677.html), [Korean](https://www.dlsite.com/girls/work/=/product_id/RJ01435094.html)
Alternative titles
- Zenbu Shitteru yo, Nee-chan.: Kojirase Osananajimi You-kun ni Mesu Ochi Choukyou Sareru made
- I Know Everything, Sister
- I Know Everything: Until I am FemCorruption Trained by my Troubled Longtime Friend
- 全部知ってるよ、姉ちゃん。 ～こじらせ幼馴染陽くんに雌堕ち調教されるまで～
- 전부 알고 있어, 누나. ~삐뚤어진 소꿉친구 하루 군에게 암컷타락 조교당할 때까지~