It means: Don’t do anything that is not necessary, and do everything that must be done simply.

Note: The main representative of energy conservationism is Oreki Houtaro, the male protagonist of the animation/light novel "Hyouka". He has a lazy character, is afraid of trouble, and pursues his own so-called energy conservationism. His life motto, "Don't do anything you don't have to do, and do everything you must do simply," is also his constant pursuit.

Houtaro believes in "energy conservation", is low-key in everything he does, seldom performs anything, and is unwilling to do anything that will consume his energy. He is absolutely insensitive to others' excessive expectations. Before entering Kamiyama High School, I held the thought that "what I did in high school was meaningless."

(For example: even if you join the baseball club and enter Koshien, you will not become a professional baseball player), and have little interest in club activities on campus; however, under the influence of your sister who must never disobey orders Under "suggestion" (almost threatening), he joined the Ancient Book Research Society, which was about to be abolished, and became one of the four members.

Extended information

"Hyouka" plot synopsis

Oreki Houtarou, a high school student with the motto of saving energy, joined for a small reason The "Classics Department" is on the verge of collapse.

The members of the Classical Literature Club include the curious baby he met in the club, the heroine Chitanda Eru, as well as Mayaka Ihara and Satoshi Fukube who he has known since junior high school.

This is a youth school mystery drama in which the four of them use Kamiyama High School as the stage to reason about one incident after another. "I'm very curious!" Houtarou's peaceful gray high school life changed because of Chitanda's words!

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