◯◯ Imouto! Umaru-chan

An anthology commemorating the anime adaption of Himouto! Umaru-chan, published in Weekly Young Jump starting from the 31st issue of 2015. All five installments were released in print as part of Himouto! Umaru-chan S. It features guest works of other Shueisha authors:

1. The first chapter「伸縮妹！うまるちゃん」- "Shinsukuto! Umaru-chan" ("shinsukuto" is a made-up word, translating roughly to "elastic little sister") from Onigunsou, the author of Mononogatari
2. 「野生妹！うまるちゃん」promoting Sugito Akira's Boku Girl
3. 「半端妹！うまるちゃん」- "Halfway Sister! Umaru-chan" by the author of Maousama Chotto Sore Totte!! Haruno Tomoya
4. Labelled "inofficial", 「干物妹！うまるちゃん大好きおじさん」by Forbidden Shibukawa
5. 「悪夢妹！うまるちゃん」a crossover with Nightmare Funk by Takemura Youhei which was also included in the third volume of the series.