moecco is a series of junior idol photobook with DVD, so called "mook" released by Myway Publishing.
Featured Shihono Ryou, Ogawa Sakurako, Mochizuki Akari, Mana, Ueno Chihiro, Hirooka Minami, Shinomiya Rin, Tachibana Yoshie, Kamiya Nene, Kuroda Aki, Kaneko Miho, Yukari, Manma Mia, Kudou Ayaka, Miura Runa, Anna Miria, Kanzuki Aika, Kubo Moe, Endou Rina, Asada Hiromi, Yuuki Kana, Asaoka Nami, Nishino Hana, Mizushima Maria, Kaneuchi Mai, Saaya, Yumemoto Erena, Tsukimori Wakana, Asada Hitomi, Ayane Chika, Sugimura Mirei, Saotome Moe, Anzai Kana, Ono Yukari,Sasaki Mai, An Natsumi, Arioka Yui, Ryouke Yua, Saitou Karin, Nakai Yukari, Izumi Haruka, Ootsuka Minami, Yamada Reina, Aina Miku, Sakurai Asuka, Morisaka Rino, Niimi Nanako, Tachibana Mari, Asizawa Nanami, Fushiki Ayano, Takahashi Maaya, Nanase Sayaka, Aoi Kako, Onodera Kotomi, Hoshi Miyuu, Iwamoto Alice, Yamaguchi Chika, Misaki Takano, Yamaguchi Eri, Erika, Watanabe Mio, Mochizuki Yuna and many junior idols.
Every single book of moecco Myway Mook is the must-buy item though, most of them are discontinued now.
When you click to open the link and find it's in stock now, I recommend you to get them because in Japanese market they're already out of stock and most of the junior idol fans don't know where the mooks are available.
No joking. If you find any, you have to get them.