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](https://mangadex.org/title/63e00bb1-6325-47a6-a89a-97efc06571ba). 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"](https://mangadex.org/chapter/093599f5-ac91-4af8-aea5-b370dd8d3d11/4)) from [Onigunsou](https://mangadex.org/author/e00c7b8b-7e11-41bb-980b-d357cf4094b0), the author of [Mononogatari](https://mangadex.org/title/dc5b9e42-1840-4307-998d-e0dfcfe2b9e6) 2. 「野生妹！うまるちゃん」promoting [Sugito Akira](https://mangadex.org/author/9c0541f7-87b0-4105-bce0-26af8371ad6e)'s [Boku Girl](https://mangadex.org/title/5927e373-f024-42ad-9307-6f4c05ea3fc4) 3. 「半端妹！うまるちゃん」- "Halfway Sister! Umaru-chan" by the author of [Maousama Chotto Sore Totte!!](https://mangadex.org/title/24d84d4c-340d-4b31-87f6-71d7e5d649d7) [Haruno Tomoya](https://mangadex.org/author/c124b14c-37a1-4fd4-80a1-6c2e29d89e80) 4. Labelled "inofficial", 「干物妹！うまるちゃん大好きおじさん」by [Forbidden Shibukawa](https://mangadex.org/author/8d449c9c-bf54-442e-ab0b-0f1e9905245d) 5. 「悪夢妹！うまるちゃん」a crossover with [Nightmare Funk](https://mangadex.org/title/ec67065e-68d9-470b-bc5e-f2dde2ce4b18) by [Takemura Youhei](https://mangadex.org/author/453efeec-2aa7-4ebd-925f-d72dcbe5211b) which was also included in the third volume of the series.