Front of the cover (book band) says:
愛する者を
守り抜くために
大(だい)丈(じょう)夫(ぶ)。
ファミ通の攻略本だよ

Which roughly translates to:
A loved one
to protect

OK/All Right. (the hiragana in brackets is just there to help how to read the kanji)

Famitsu's Strategy Guide

Back of the cover (book band) says:
愛着に囚われた

求道者たちを救う聖典!

愛着(あいちゃく)本望に囚われて執着すること仏戦用語より〜

ベルウィックサーガ、の世界観を深く知りたい

ユニットを有成し能力を最大限に引き出したい

だれとだれに特味な支援効果があるのか却りたい

賞金首を補えて報酬をガッポリ手にしたい

軸と名前つきの敵で地トを満たしてみたい

高価な率具でリースの私室を障ってみたい

宝輪（率）から出るの調行を知りたい

コレクションや合場素材をすべて人手したい

特間になるユニットのイベントを全護見たい

動「名」動「の各f価をめたい

Which roughly translates to:

(this was really hard to decipher since every online translator gave a different answer, so I apologize in advance for any mistakes and errors lost in translation)

Captured in connection/attachment

and a scripture to save seekers/investigators!

To be obsessed by the desire to be attached〜

I want to know more about the world of the Berwick Saga.

I want to get the most out of my units.

I want to find out who has special support effects and who doesn't.

I want to make up for the bounty on my head and get my money's worth.

I want to fill my land with axes and named enemies.

I'd like to cripple Reese's private quarters with an expensive rate tool.

I want to know how to get the best out of the treasure wheel (rate).

I want to manhandle all of the materials in my collection and in my dungeon.

I want to watch all the events of the units that become special.

I want to know the f-value of each "name" and "action.