Two junior high school girls in Tochigi Prefecture put an antidepressant agent into a 39-year-old teacher's lunch, forcing him to go to a hospital after suffering dizziness, the prefectural education board said Tuesday.

"We thought the teacher nagged only us. We wanted him to be kinder (with the agent's effect)," the two students were quoted as saying.

The two girls obtained five tablets of the agent from a female classmate who bought it via the Internet to help cure insomnia. They mashed up three of them, and put the powder into the teacher's miso soup on April 18, the board said.