Time Trip App (Blu-ray release 2015-1-21) tells the story of a Japanese student who uses an app for cheating in his history examination. This app later caused his teacher, two other classmates and himself to time travel to the past. As interesting as this may sound, this movie is a failure.
There should be many opportunities to create jokes from this situation, but there is so few jokes that it cannot be viewed as a comedy. As a drama, it fails because it never properly explain exactly why the invaders decide not to attack. As a melodrama concerning the teacher and her relationship with the students, it is simply too shallow.