Oxenfree Duology

Oxenfree

Alex (Erin Yvette), a teenager, is on the last ferry heading to the fictional Edwards Island for a weekend party. She is accompanied by Ren (Aaron Kuban), her stoner friend, and Jonas (Gavin Hammon), her new stepbrother. On the island, Alex and company meet Clarissa (Avital Ash), the ex-girlfriend of Alex's deceased brother Michael, and Nona (Brittani Johnson), Clarissa's best friend and Ren's love interest. Ren explains the island was once a military base and that the island's only permanent resident, Maggie Adler, has recently died. After camping on the beach, Alex, Ren, and Jonas explore the nearby caves, where it is rumored certain radio frequencies cause supernatural events. In a small cavern, Alex tunes her radio to a floating shape and unexpectedly forms a dimensional rift. A voice answers and the teens experience visions before passing out. Jonas and Alex awake in front of a communications tower elsewhere on the island. Ren calls, having passed out in the woods, while Clarissa calls from the decommissioned military fort on the island.
In the woods, Jonas and Alex encounter supernatural events, including Alex's reflection in the water communicating with her, objects moving on their own, and time looping repeatedly. Time corrects when Alex plays a reel-to-reel tape. They spot Nona, who claims she saw an alternate Jonas and Alex. Alex and Jonas find Ren, but after another time loop, they find him possessed by a "ghost". Using the radio, Alex creates another rift which returns Ren to normal. Ren and Nona return to the tower.
At the military fort, Alex's reflection appears in a mirror, giving Alex advice. A ghost questions them and possesses Jonas, revealing that the ghosts are the crew of the submarine USS Kanaloa, thought lost at sea. Alex creates another rift that revives Jonas. They find Clarissa, but time loops to her jumping to her death before disappearing. Nona, Alex, Jonas, and Ren regroup at Harden Tower. Unable to send a radio transmission off the island, Ren suggests finding the key to Maggie Adler's estate, where she kept a boat. At Adler's estate, a possessed Clarissa talks with Alex; her conversations and scattered letters left behind by Maggie Adler reveal that Adler mistakenly interpreted scrambled messages from Kanaloa as an enemy transmission, and the submarine was sunk by friendly fire. The crew was not killed, but transported to another dimension due to the submarine's experimental nuclear reactor. Adler and her friend Anna had attempted to communicate with the Kanaloa crew via radio, but Anna was absorbed through the rift. The Kanaloa crew intend on using Alex and her friends' bodies to escape the dimension, keeping them on the island long enough for their possession attempts to be successful.
Alex and the group discover Maggie Adler's plan to fix the rifts—crossing to the other side of them and tuning the radio within. Alex repeatedly loops back to the past, mainly to times she talked with Michael. A ghost possesses Jonas and attempts to bargain with Alex, offering to spare her and the rest of her friends if they leave Clarissa behind. Returning to the caves, Alex tunes into a rift that sends her into a void. Encountering the possessed Clarissa, the ghosts warn Alex that she will die if the rift is closed, and Clarissa will be kept by the ghosts if Alex leaves through the rift. Alex can choose to leave, erasing Clarissa from existence; close the rift herself, trapping her with the ghosts; or, if she has found certain letters from Maggie Adler that mention crew members by name, Alex can appeal to them directly, convincing them to let both Clarissa and her go. The reflection of Alex giving her advice is revealed to be Alex from the future. She loops back to a conversation with Michael, who admits that he and Clarissa are planning to move away from town and asks for Alex's advice. Time then corrects.
Alex wakes up with the others on the ferry back home; Jonas informs her that whatever she did fixed the rift and that everything is normal. Everyone reveals that, for a limited period, they revisited memories. They then swear to not tell anyone about their experiences, and Nona takes a final group picture.

Endings

In an epilogue, Alex reveals the fate of the characters, with Nona's picture of the group shown and the outcomes dependent on actions made during the game:

Clarissa's friendship with Alex and Michael can be either preserved or destroyed. Clarissa can also be sacrificed to the rift, with no one remembering Clarissa except Alex herself. If she is saved, she will either drop out of school or continue her studies.
Ren and Nona may or may not be in a long-distance relationship depending on Alex's actions.
Jonas's relationship with Alex can be either preserved or destroyed.
Michael can be revived if Alex encourages him not to move away in the time loop. If so, Jonas and Alex will cease to be step-siblings. The player's actions can either destroy or preserve Michael's relationship with Clarissa.
Alex also describes her own plans; she may go to college, either in or out of her hometown, or take time off. Thereafter, the screen flickers and Alex tells the player she is going to Edwards Island and is meeting Jonas for the first time, revealing that time is still looping.
If the player starts another game with the same save file (New Game Plus), Alex has the chance to send herself a message from the island. After the epilogue, a new scene plays of Alex, Jonas, and Ren at a supermarket waiting to buy alcohol before getting on the ferry. Tuning her radio, Alex receives the message her future self sent from the island. Depending on the message sent and how the player responds, Alex, Jonas, and Ren can decide not to go to Edwards Island at all, preventing the loop.

Oxenfree II: Lost Signals

Oxenfree II's story stands alone from its predecessor, although knowledge of Oxenfree gives greater context to the events of the game. Five years since their last game, Riley travels to her hometown of Camena Coast, and sets up radio transmitters along the coast to help study radio anomalies. Once Riley and her partner-in-coworker Jacob set up the first radio transmitters, a portal appears above Edwards Island, which is near them. Riley and Jacob start experiencing many hallucinations and time loops. Jacob tells Riley about how he had met an old woman from Edwards Island named Maggie Adler who had studied the anomalies on Edwards Island. Based on that piece of information, Riley and Jacob come up with a plan where they would visit the other three highest points of Camena Coast and build three more radio transmitters, using which they could close the dimensional portal.
Setting up the transmitters, Riley and Jacob encounter three teenagers—Olivia, Charlie, and Violet—who are trying to amplify the portal with old military radio equipment. They are connected with "Parentage," a cult involved with Edwards Island that seems to be appealing to Olivia to help open the portal. When Riley confronts Olivia about her efforts to open the portal, she explains that beings from the portal have promised she can see her deceased parents again if she helps them. At the end of the confrontation, Olivia gets possessed by what turns out to be Alex, the protagonist from the first game. She reveals that she and her friends were trapped by the original rift they opened when they visited the island, and that their desire is to escape.
While the portal appears to close once the transmitters are activated, Alex—through possessing Jacob—tells Riley that the portal had been partially open for some time and entities she refers to as "the Sunken" (the crew of a lost World War II submarine) were communicating with Olivia to convince her to fully open it: while Alex wanted herself and her friends to escape through possessing willing volunteers, the Sunken seek to escape by any means necessary, putting Camena Coast at risk. Alex tells Riley that Olivia is on her way to Edwards Island's communications tower to reopen the portal, and that she needs to be the one to stop her.
Riley and Jacob steal a boat from Camena Harbor, and take it to Edwards Island. Once there, they confront Olivia again who is opening the dimensional portal directly above the communications tower. Riley and Alex both attempt to appeal to Olivia, but Olivia is then possessed by the Sunken, who then possesses Riley. Riley is sent through several surreal hallucinations seemingly in alternate dimensions, and successfully navigates them to a final vision containing Riley's future son, Rex, who in the present timeline she is currently pregnant with. This vision of Rex seeks to convince Riley to believe more in herself and have the confidence she needs to escape being possessed by the Sunken in the void, and shortly afterwards she is transported back to reality, where she manages to stop Olivia and disrupt the formation of the portal.
After the Sunken's efforts are subdued, Jacob, Olivia, Riley and Alex all appear together in front of the portal, where Alex explains that one of them must go inside and tune the portal to close from the inside, trapping them and the Sunken potentially forever but allowing the others to go free. The player can then choose for either Riley, Jacob, or Olivia to enter the portal and close it from the inside, which can change the ending of the story. Regardless of who is chosen, the portal is closed and Camena is saved from the rifts. Alex and her friends are no longer trapped in the dimensional rift, and Alex sends a souvenir box to commemorate Riley (either to Riley's father or Rex depending on the ending) which the player can sift through to get different dialogues and notes based on the choices they made in the character interactions throughout the story.