Dennou Boukenki Webdiver

Dennō Bōkenki Webdiver (電脳冒険記ウェブダイバー Dennō Bōkenki Webudaibā, lit. Cyber Adventure Record Webdiver) is a mecha anime produced by studio Radix.

Set in the year 2100 where the world is tied together by a computer network. The children of the world become Web Divers, adapting their consciousnesses into data, and love to play together in the cyber park called Magical Gate. However, a mysterious computer virus appears beginning to destroy Magical Gate from the inside out. In cyberspace, programs called Web Knights have been created to protect the children. But, the computer virus has turned all the Web Knights against the children. The only Web Knight to escape the "brainwashing" is Gladion. Gladion seeks the help of Kaito Yuki, a Web Diver who is in the fourth grade.

Note: The episodes title are rough translation from the Japanese title.

Dark Lullaby! Webmonster's Trap (Episode 15)
A monster hypnotizes everyone in the city.

Attendant of Darkness. Lada's Trap. (Episode 39)
Some monster hypnotize Gladion's friends to reveal his background.