After regaining her squid-like abilities, Ika Musume plans to resume her self-appointed mission to destroy all of humanity. However, her carefree job as a waitress in the Lemon beach house meant she cannot help but laze around during her spare time! On top of that, she is saddled with many problems, such as being pursued by a group of alien-obsessed individuals and catching the interest of a crazy girl. Picking up after the conclusion of the first season, Shinryaku!? Ika Musume follows the hilarious life of Ika Musume as she plots her next invasion of the surface world. [Written by MAL Rewrite]

Yuu Narukami moves to Inaba, a seemingly quiet and ordinary town, where he quickly befriends the clumsy transfer student Yousuke Hanamura, the energetic Chie Satonaka, and the beautiful heiress Yukiko Amagi. Shortly after Yuu's arrival, a chain of mysterious killings begin to occur on foggy days. At the same time, rumors about a strange television channel—dubbed the "Midnight Channel"—spread like wildfire; when staring into their TV screen at midnight, a person may see their soul mate. After witnessing the most recent murder victim on the Midnight Channel, Yuu attempts to watch it again, only to realize that he can traverse into the TV and reach another world overrun with "Shadows," evil creatures of the dark. Realizing the link behind the hidden dimension and the murders, Yuu and his friends attempt to crack the cases by exploring the diabolical world of the Midnight Channel using their "Personas," awakened manifestations of their "true selves." [Written by MAL Rewrite]

Most people would prefer being the protagonist of a world full of adventure, be it in a game or in another world. But, unfortunately, a certain girl is not so lucky. Regaining the memories of her past life, she realizes that she was reborn in the world of Fortune Lover—one of the games she used to play. Unfortunately, the character she was reincarnated into—Katarina Claes—is the game's main antagonist, who faces utter doom in every ending. Using her extensive knowledge of the game, she takes it upon herself to escape from the chains of this accursed destiny. However, this will not be an easy feat, especially since she needs to be cautious as to not set off death flags that may speed up the impending doom she is trying to avoid. Even so, to make a change that will affect the lives of everyone around her, she strives—not as the heroine—but as the villainess. [Written by MAL Rewrite]

The movie is a retelling of the Drum Island arc with new music and animation. Vivi has been removed from the plot while both Nico Robin and Franky, who joined the crew after the Drum Island arc, have been added. The movie also has the Straw Hat's new ship, the Thousand Sunny. It has been stated that Oda will be creating a new character for this movie, Wapol's older brother, Mushul, who also appears to be a Devil Fruit user. 

(Source: Wikipedia)