"Isekai Tsushin" (Otherworld Communication) is a smartphone game developed by Hige to deko, categorized under genres including whip/rope/candle play, married women, depravity/immorality, bondage, trance/suggestion, discipline, and non-consent. With 150 copies sold, the story follows a group of girls battling monstrous beings on a remote island in the middle of the ocean. The cast includes Fuyuko, Rio, Chiaki, and Shizune, each with their own distinct personality.

The story is set on a remote island where a warp device is under development. Rio's grandfather had been working on the device, but during its preparatory phase, it accidentally connects to another world. As grotesque monsters pour out of the device, Fuyuko and Rio take up the fight against them. The story unfolds around this battle, depicting a variety of situations including sexual harassment, brainwashing, training, confinement, and lewd medical examinations.

In terms of gameplay and player experience, the combat system is described as the same simple battle system used in Ayame Aria Senki. Beyond combat, the game features a wealth of H-scenes, with 45 base CGs (not including standing illustrations) and over 200 scenes in total. Players can progress through the story by making various choices, with H-scenes changing depending on those selections. Both battle areas and dialogue areas are available, allowing players to move freely between them.

Regarding the characters and presentation, each character has a unique personality and background. Fuyuko is a demon hunter with a cool beauty persona, while Rio has a strong-willed personality. Chiaki is a married woman and former gravure idol, and Shizune is a cold-hearted police officer assigned to the paranormal division. The H-scenes are backed by numerous CGs and scenarios, letting players enjoy a wide range of situations.

In terms of sales performance and market positioning, the game has achieved a reasonable track record with 150 copies sold. However, since detailed rating data is not available, much about the game's critical reception remains unclear. The circle has expressed their desire to continue with the same passion in future titles, and they feel satisfied with the result of pouring everything into the erotic content. That said, the game has been noted to have several areas for improvement, suggesting room for refinement in future releases.