Samurai Angel Wars

The story is about a group of high school students who suddenly get sucked in by a time hole while watching a Sengoku show together. After the time slip, they find themselves right in the midst of a severe battle that happened 440 years ago, during the real Sengoku period. They are forced to grow up and depend on each other, as they are struggling to survive during one of the most turbulent times in Japanese history.
(Source: Tokyohive)