I think he put the cart before the horse because he started taking action before making a detailed plan.

He mastered the Judo technique, Matsuha Kuzushi.

He vowed to live through this world and the next with the spirit of once-in-a-lifetime encounter.

This text is fully justified.

This story ends with him reaching a happy ending.

In order to reduce food waste, we should plan our food consumption.

She gave him a kiss.

He kissed her.

The mouse squeaked 'chu'.

I think that person is what you call a 'chuunibyou'.