【朗報】俺の許嫁になった地味子、家では可愛いしかない。 地味かわ
Eng: "My Plain-looking Fiance is Secretly Sweet With Me."

A light novel series. It began as a web novel on Shousetsuka ni Narou on October 18, 2020. The first print volume was published on February 2, 2021 by Kadokawa under the Fujimi Fantasia Bunko label.
"rouhou" ore no iinazuke ni natta jimiko ie dewa kawaii shikanai.