Short specials included in the Onii-chan Dakedo Ai sae Areba Kankeinai yo ne Blu-rays and DVDs.

The story takes place between the first and second season, where Rimuru confronts the swirling conspiracies in the Coleus kingdom.

With an endearing protagonist and luscious art, this seaside slice-of-life story offers tranquility in the chaos of the modern world. For two years, Wakana Kinme has run a laundry service in the seaside resort town of Atami, where she's built a fulfilling life making friends with the locals and visiting hot springs. Although Wakana has no knowledge of her own past, her cleaning services safeguard memories imbued in customers' precious items.

Yakou, a gentle human woman, works at a detective agency. Tounome is a smart and gentle invisible man. The invisible man's ability is perfect for detective work. However, the blind Yakou can still figure out where Tounome is, even if he disappears. Before they know it, the two become attracted to each other...?