Text transcribed for easy reading:
Panel 1 - 1866: Tokugawa Yoshinobu, the 15th Shogunate, rules Japan
[picture of Shinsengumi holding sword]<- His army + police are the Shinsengumi
Panel 2 - Later in 1866: Saigo Takamori and Kido Takayoshi form the Satsuma-Chōshū alliance to restore the emperor to power [picture of handshake]
Panel 3 - 1867: Emperor Meiji ascends the throne after his father's death. His supporters force Yoshinobu to resign, although he still holds power [picture of Shinsengumi saying "We're still here!"]
Panel 4 - 1868: Battle of Toba-Fushimi starts the Boshin War, Yoshinobu is defeated and stripped of all power [picture of Shinsengumi running away from one of the emperor's soldiers, shouting "Ahhh!"]
Panel 5 - 1869: Shogunate forces escape to Hokkaido and establish the separatist Republic of Ezo [picture of Shinsengumi saying "They'll never find us here!," with a giant arrow pointing to him that states "Look! Shinsengumi!"]
Panel 6 - May 1869: The Battle of Hakodate finally and officially ends the Tokugawa Shogunate, and the emperor's power is completely restored [picture of Shinsengumi slain by the emperor's forces]
(fun note: my computer didn't think "Shinsengumi" was a real word, and kept urging me to correct it to "gumshoeing")
[source: various textbooks. I can't remember which ones at the moment, but the information is fairly standard history]