Muchuu ni Saseru Kimi ga Warui

It’s been almost a year since Haji started living together with his beloved boyfriend, Ren, who happens to be what people would call an “otaku.”
One day, Haji finds out that Ren went to a café they’d promised to visit together, only he went with a plushie of his favorite character instead.

Overcome with jealousy, Haji ends up calling Ren’s cherished plushie “stuffing,” which leads to a huge fight...!?

(Source: Kasakura Shuppan, translated)

Note: Includes one extra chapter.