Doujinshi include:

Curiosity Never Stops
Giri Giri Sisters Complete
HINA Project
Immoral Girl (COMIC HOTMiLK 2009-06)
Kokuhaku Heat Up Confession Heat Up (COMIC SIGMA 2008-09 Vol.23)
Love Selection
Mai Favorite
Miss Contest Rhapsody
Rehabilitation Ward 24 Hour (Giri Giri Sisters)
Step Up (Giri Giri Sisters)
STRAWBERRY PANIC 3 (Ichigo 100%)
Student Exchange Recommendation Seitou Koukan no Susume (COMIC ExE 14)
Suki ni Nattara Icchokusen! It’s A Straight Line Once You Fall In Love
Sweet Hearts [Full Color]
Sweethearts
Welcome to Tokoharusou
Zoku Koukishin ga Tomaranai (COMIC HOTMiLK 2016-08)