He was hiding the fact that he was an illegitimate child.

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.

He gave me the cold shoulder.

The family crest of my house is Kago-me-mon.

He is known as a comic character.

Their problem was clearly visible to me, a bystander.

Her problem is obvious to me, who is looking at it from an outsider's perspective.