It is an adventure game with multiple endings. An original script written by a well-known light novelist with a total of 400,000 words. With reasoning, suspense, love, and science fiction elements, it allows players to embark on a highly immersive journey of salvation on the submarine train.
Players praised the game's core time loop mechanic, which puts the protagonist Ren in a repeating cycle where a train derailment and crash continually resets. Reviewers drew comparisons to acclaimed time travel stories like "Steins;Gate," noting that the game establishes its own distinct rules and logic around this concept. One player highlighted how the in-game explanations, while at times unorthodox, ultimately resulted in an engaging and thought-provoking time travel system.
Reviewers highlighted the game's branching narrative structure and the tangible impact of the player's choices as Ren. One user mentioned how certain decisions led to unexpected or even tragic consequences, forcing them to carefully consider the weight of their actions. Another player noted that the game even punishes save-scumming, further reinforcing the gravity of the choices. Across the board, players felt the branching paths and impactful decision-making were standout strengths.
The game's narrative and character development also impressed players. Reviewers praised the balanced blend of suspense, drama, and humor in the writing. The cast of characters, particularly the protagonist Ren and his childhood friend Cecilia, were frequently cited as highlights. One user noted that the game subverted their expectations regarding the characters, leading to impactful and emotionally invested moments.
While the gameplay and narrative were the primary draws, players also commended the game's strong audiovisual presentation. Reviewers lauded the striking anime-inspired character art and detailed backgrounds depicting the underwater train setting. The soundtrack was also singled out for effectively enhancing the tense and suspenseful atmosphere. Despite some minor translation issues, the overall presentation was praised for complementing the engaging gameplay and narrative.