New Game Plus

New Game Plus is a mechanic which was first introduced in Gear Detective and was carried over to Crossing at the Farthest Horizon. Once a player has completed a first playthrough of the game, they are able to go through the chapters of the game again, in any order they want, to replay through them again. This unlocks further options for responses that the player can give when prompted, many of which are humorous, focused on the romantic substories, or in some way rude, unusual, or sexually suggestive. Some of these give chances to earn pink stars at the end of a chapter, gaining a majority of which unlocks the game's "special ending".

The new game plus also allows the player to see the stars they have gotten for each chapter, which they cannot do on their first playthrough. They are also given the option to skip the different sections of the chapters ("adventure" & "Investigation", in Gear Detective, and "adventure", "map" & "search" in Crossing at the Farthest Horizon), allowing them to play through them again without the need to re-complete specific gameplay portions.

Luxury Spa scene
In Crossing at the Farthest Horizon the player can unlock an extra scene by picking responses available on new game plus, in chapter 3. What would otherwise normally be the transition into the next "Kyosuke Ayana" episode is extended to include Hitomi Akeneno and Tsukiko Nagise taking a trip to a nearby luxury spa. While there, the player is shown an image of the two girls sitting in the spa, with noticeable cleavage above the waterline. They begin to have a "girl talk", which Hitomi isn't good at.

The first topic is about love, with the player being given the choice of what to say in response to who Hitomi has a liking for. They can either say that Hitomi isn't ready for that yet, or say Kyosuke, or Yukiya. They can also side-step this and ask if her sister Ritsu likes anyone. This results in a misunderstanding by Tsukiko, who assumes that Hitomi has incestuous feelings for her sister. After this topic, they discuss fashion, with Tsukiko bringing up her large bust size. Hitomi wonders if they should talk about their figures, but decides against it due to jealously over Tsukiko's large chest compared to her fairly flat one. She decides to talk about baseball instead, which Tsukiko reveals herself to be a fan of, before the two finally decide to leave the spa.