So why I'm retelling information that's easy to get from VNDB? It's because Viper-F40 is a totally different game and it's absolutely wrong to measure it by past Sogna experience. First of all, Viper-F40 has only one big story. That's not a new thing, of course, after GTS, BTR and CTR. But it is not based on any previous short story which means the setting and characters are created anew. And now the main part - the game takes almost 4 hours. And that's at least three times longer than any previous Sogna game. And I aspire to prove my point by showing that contents-wise it's also an absolutely new game.
VNDB link: https://vndb.org/v977
Youtube walkthrough: https://www.youtube.com/watch?v=GESdVh2RfTY&index=49&list=PLENAECnNmAq_3TQ0rXcu0n95aygm3PPQU
Synopsis: A police investigation unfolds as detective Lilia and her freelancing friend Raika attempt to solve the mystery of three missing persons. Their investigation draws the ire of a small gang...
Structure: Single route divided into 6 days.
Length: Took me 3 hours 45 minutes
Game type: Normal ADV with location choices.
Difficulty: Easy - one single road route.
Character Design rating: 7/10
Protagonist rating: 7/10
Story rating: 9/10
Game quality: 9/10
Overall rating: 8/10
Protagonist: There are two protagonists in this game. And the game changes protagonists' perspective from time to time at certain points. First protagonist is a more traditional police woman Lilia. She has her small secrets like an affair at work but overall she's normal. That's basically our EVE Marina and she also works not just in police, but in special investigation unit. The second protagonist is female detective Raika and things have been running slow for her, so she agrees to try and help Lilia with the case. That's our typical Kojiroh, but in female form (since Sogna games need women!) - untidy, careless, but with a spark of detective genius. She also has an assistant Seela who is a daughter of police department chief. Raika used to serve in police, but quit it when the killer she caught was released due to killing under the state of affect. Both main heroes are nice and they interact in an amusing way, but they're not Kojiroh and Marina and the length of the game does not let to develop characters further.
Theme: Main theme of the game is the same as in Eve: Burst Error, but explicit explanation can easily become a spoiler.
Overall comments: I would not consider F40 to be a degraded clone of EVE: Burst Error. In the end those are absolutely different stories with only archetypes of protagonists and main theme being the same. Sogna has a unique approach that is implemented in dialogues driven story and high animation level. There are so many twists in the story that I happened to blame the same persons for criminals then rehabilitated then blamed again for several times. But there aren't extra scenes in the game. If some seemingly unnecessary scene is shown, it has some meaning - and it's satisfying to notice those short scenes upon watching the game for the second time. As I see it, Viper-F40 is Sogna's attempt to go away from fanservice works towards serious stories. Whether Sogna succeeds in it or not we shall know from its remaining games and hopefully my reviews of them.