Quotes from "World Trigger"

Yūma Kuga said:

(referring to his father) There are three lessons he taught me when I was six. Lesson one: Protect yourself, by yourself. Parents can't protect you forever. Work out or think hard and figure out a way to take care of things by yourself. Don't get close to things you can't take care of. Use your imagination to avoid danger. Lesson two: There's more than one answer. Things can be resolved in many ways. On the contrary, there's no answer in some cases. Don't get hung up with one way. And finally, lesson 3: Don't think your parents are always right.

I am not a hero. I can't make anyone happy with any result. I can only do what I deem right with me not hating my choice at a later point.

Yugo Kuga said:

Know how strong you are... and do what you can do. If you misjudge your abilities on the battlefield... you'll get yourself killed.

Rules make the world work. They don't protect you.