"Don't ever, EVER — open the door to my room."
Extra Case: My Girlfriend's Secrets is a RPG Maker MV Visual Novel developed by Sounding Stone and co-developed with MaouCat Studio as part of the Physical Exorcism Series. It will be available for PC on September 12, 2022 and has a demo available.Following the events of Case 02: Paranormal Evil, Marty and Sally are now officially in a relationship. However, Sally appears to still be hiding something; Marty knows she's entitled to her privacy, but when she invites him to her home and warns him to never, ever enter her room, curiosity gets the better of him. Once Marty opens the door and witnesses something he shouldn't have, he gets attacked...only to wake up earlier in the day. Now trapped in a time loop, the only way Marty can escape is by learning all of Sally's secrets, and connecting them together to uncover the ultimate truth.
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This game contains examples of:
- Big Bad: Sally seems to be the main villain, since she kills Marty in many loops in order to protect her secrets. In reality, she's being controlled by her Split Personality, "Seira," aka Shadow, who is based on her traumatic memories of her sister and her Survivor's Guilt over the car accident that killed her boyfriend and sister.
- Bittersweet Ending: In the final ending, Marty and Sally manage to convince the latter's Split Personality, "Seira"/Shadow to stop trying to kill Marty. Marty also covers up all evidence of Shadow's serial killing in order to prevent Sally from being implicated. However, Sally still has to live with the guilt of all the murders Shadow committed and Marty lost much of his sanity due to the time loops. Sally is also disturbed by Marty's newfound ruthlessness and his unexplainable knowledge of Shadow's actions.
- Cult: Sally's mother, in her grief over losing her husband, joined the Cult of Nya and donated most of her savings, since the cult promised precognitive powers to give their members peace of mind. She became so obsessed with the cult that she neglected her daughters and made them feel unloved.
- "Groundhog Day" Loop: Every time Marty uncovers one of Sally's secrets and gets killed for it, or otherwise experiences an unsatisfactory outcome, he awakens earlier that day, retaining the knowledge of past loops in order to uncover even more secrets. However, his memories of each loop is hazy and he often has to review old information when he finds it again. For the final loop, Nya gives Marty all his memories back.
- He Knows Too Much: The majority of Marty's deaths are caused by Sally going to extreme lengths to conceal her secrets. However, she doesn't start killing him until he discovers a truly incriminating secret, such as the existence of her basement.
- Identical Stranger: One of the clues Marty can find is a photo of one of Sally's previous boyfriends, John, who looks exactly like Marty but with darker hair and eyes. This similarity is noted in-universe, which is why Sally's Split Personality, Shadow, wants to cut Marty's head off in order to stitch together a new body for John.
- Living Emotional Crutch: Brucie points out that Marty lost his family and only friend in a car accident, which means Sally is all he has left and that he can't live without her. In endings where he and Sally break up, he's never able to most past her, and he goes insane in any ending where she dies. In the final ending, Marty is willing to hide the body parts of Sally's previous boyfriends in order to protect her from the law and prevent public opinion from turning against her.
- Love Triangle: According to Seira's diary, she started treating Sally coldly because she was jealous that Sally dated John, who she also had a crush on. She wanted to tell Sally and John the truth in order to reconcile with them, but died in a car accident before that could happen.
- Red Herring: Due to the supernatural elements in previous entries, Marty initially assumes "Seira" is an evil spirit possessing Sally. Sally herself also showed a negative reaction to the Nazar Amulet, which is supposed to hurt evil spirits. However, when he tries to use the amulet on "Seira," she is completely unaffected. It turns out she's actually a Split Personality, which means she's not something that can be exorcised.
- Replacement Goldfish: Sally's first boyfriend, John, died in a car accident, and her next boyfriends are always people who resemble him in some ways, though given how much she mourns her other boyfriends and cares for Marty, she still loves them in a genuine way. Despite feeling some jealousy towards John, Marty is understanding of the pain Sally is going through and doesn't fault her, since he also lost loved ones in a car accident. Unfortunately, Sally's Split Personality, "Seira"/Shadow, only sees Sally's later boyfriends as replacements for John and seeks to stitch together their body parts in the mad belief that she can bring John back.
- Straw Misogynist: In the ninth ending, Sally confesses to her crimes, but her deeds become viral, resulting in mass public backlash. Many of the online comments are outright misogynistic hatred of women, making it clear that those commenters are looking for "socially acceptable" ways to express their bigoted views. Other commenters criticize them for being oddly silent in cases where women are abused.
- There Are No Therapists: Averted in that Sally does have a therapist, though they never make an actual appearance. The therapist noticed that Sally has a Split Personality, and their reports can be found in Sally's basement.
