|Full Name||Imōto-tachi no pajamapāti|
|English||Sisters' Pajama Party|
|Date of Release||January 10, 2019|
|Number of Pages||264|
|← Volume 10||Volume 12 →|
Reference to Authors previous work
- Kirino Kousaka from Oreimo is shown giving Life Counseling to Sagiri. It is revealed that she is now in high school and is a huge fan of Eromanaga-sensei's illustrations.