Ume (APRICO*) — http://www.pixiv.net/member.php?id=1291097

Natsusuki The Idolmaster Doujin released Apr 20 '16 Comedy Natsuki x Riina Yuri

Love Times Four The Idolmaster Doujin released Jun 15 '16 Comedy Natsuki x Riina Rina x Takumi Romance Yuri

A Crown of Stars, Made of Statice The Idolmaster Doujin released Oct 27 '16 Natsuki x Riina Yuri

Sweaty Summer by Bocha, Ume (APRICO*), and Yuika The Idolmaster Doujin released Apr 6 '17 Natsuki x Riina Rin x Uzuki Rina x Takumi Yuri

Aches and Pains The Idolmaster Doujin released Dec 7 '17 Menstruation Natsuki x Riina Yuri

Blue Orange The Idolmaster Doujin released Jan 28 '18 Comedy Natsuki x Riina Yuri

Valentine’s Comic About Riina With A One-Sided(?) Crush On Natsuki The Idolmaster Doujin released Feb 15 '18 Natsuki x Riina Valentine's Yuri