Itsuka Subete ga Kimi no Chikara ni Naru

Itsuka Subete ga Kimi no Chikara ni Naru

Book Cover.jpg


From the pen of Kaji Yūki, an established voice actor known for voicing numerous protagonists of controversial works, namely Eren Jaeger from Attack on Titan. The book tells the story of the troubles he shared back in his early days, and how they now form his passion towards this occupation of “voice acting.” A toast to all who are working towards their dreams! What does it mean to hold a dream? And what do we do to make it a reality? 

Comes along with exclusive photogravures and a special interview with Sound Director Mima Masafumi!


►Physical copy available at: amazonRakutenブックスKinokuniyahonto (and more)
►Digital copy available at: bookwalker

▼ Information



 English: One day, everything will become your strength;
 Everything becomes your power someday
 Japanese: いつかすべてが君の力になる
 Abbreviations: ItsuSube 
Series  Worldly Wisdom for 14 years old (14歳の世渡り術)
Author  Kaji Yuki
Publisher  Kawade Shobo Shinsha (河出書房新社)
Release Date  May 10, 2018
Pages  188 pages
ISBN  978-4-309-61713-8
Price  ¥1,404(¥1,300 without tax)
Adaptation  Itsuka Subete ga Kimi no Chikara ni Naru (manga)


▼ Table of Contents 

Chapter 1: Back when I was 14 | 僕が14歳だった頃

Chapter 2: What it means to pursue a dream | 夢に向かって進むということ

Chapter 3: What kind of job is a “voice actor”? | 「声優」って、どんな仕事?

Chapter 4: The meaning of professional | プロフェッショナルとは

Chapter 5: In order to continue being chosen | 選ばれ続けるために

▼ Photo Gallery

▼ Background

Some of you may already know this but, the title itself is a phrase that played an extremely big role in Kaji’s life, serving as the very spark of his career.

It literally translates as:

”One day, everything will become your strength”

Just to give a brief background on Kaji’s younger days, he was a child that loved to give his all towards a goal. Once he had set his eyes on an ambition, he would spend all his time and effort in trying to achieve it.

When he aspired to be a soccer player, he would be kicking the ball all day; when he aspired to be a mangaka, he would be drawing all day; when he aspired to be a scientist, a science encyclopedia is all he would be reading.

He was an extreme child who loved working towards a dream, yet couldn’t be settled on a dream. Until one day, when he encountered these words by a voice actor:

“Being a voice actor means that no matter what you pour your heart and soul into, someday, those efforts will surely return to you as your strength!”  

Upon receiving those words, he decided that it was his calling as someone who loves to pour all his heart and soul into everything to be a voice actor.

Sure enough, now as he reflects on his own career, this was the dream job that allowed him to live the lives of a soccer player, a scientist, and everything else that he has ever wanted to be.




有一天,一切都會成為你的力量:解析超人氣聲優梶裕貴成長歷程的首部中文版作品,和你分享將「夢想」變成工作的方法。 [Jan 18, 2019]

Title: 有一天,一切都會成為你的力量
Translator: 黃詩婷
Publisher: 瑞昇
Price: 350元/¥
Order at



[Nov 4, 2018]

Since its release in May this year, the book has been a big hit that called for immediate reprints, and it will now be adapted as a manga in Sho-Comi!

Serialization will begin in Shogakukan’Sho-Comi Vol. 24 (to be released on November 20th)

Read more →


[Jun 8, 2018 – the Hand that Feeds HQ]

The book was released in May and since then it has sold over 50.000 copies. He’s the first seiyuu to sell this much as a writer/author. Kaji thanked everyone for the continuous support for his book yesterday.

It topped Kawade‘s book chart as soon as it was released and ever since it occupies its #1 spot on their weekly chart.

Read more →

KAJI’S FIRST BOOK CALLS FOR 3RD REPRINT (Exceeding 30,000 copies)

[May 16, 2018]

The book Itsuka Subete ga Kimi no Chikara ni Naru has called for a reprint on its second day of release, following with a 3rd reprint yesterday on the 15th.

As of now, the book printing has reached 30,000 copies.

Read more →


[Apr 3, 2018 by @KAJI_staff]

From Kawade Shobo Shinsha Publishers’ popular series, titled Worldly Wisdom for 14 year olds, the release of the book “Itsuka Subete ga Kimi no Chikara ni Naru” has been confirmed.

To be released early May 2018.

※Pre-orders will be open from early April.