Koushirou is my best friend.

Kou Sennen is my best friend.

Photochemistry is a branch of science that studies how chemical reactions proceed under the influence of light.

The photoelectric effect is a phenomenon where a material emits electrons after absorbing light.

After he solved the problem, he said, 'It's like seeing the true form of a ghost or a withered silver grass,' meaning things are not as scary as they seem.

Theravada Buddhism is a sect of Buddhism and is mainly spread in South Asia.

He boarded the fighter plane as a tail gunner.

Hikohikodeken is my best friend.

He continued to hide his talents as if to hide his light and conceal his tracks.

The North American Aerospace Defense Command is responsible for the aerospace defense of North America.