Arata Kaizaki (27) Unemployed

No One Cares

Test Subject

I'm with Weirdo

Complete Contract

Freaking Out

Generation Gap

Fully Enjoy Student Life?

Different Habits

Humiliation

Gradually Making Friends

Support Staff

Safe Life

Surprise Attack

A Long Day

Now Older Than my Former Teacher

Zero Points in Communication Skills

That Was Well Said

Reflective Statement

19.5 Seriously Weird

Heaven and Hell

Natural Player

Insensitive Ohga

Distance Dilemma

Work and Personal Feelings

No Silver Pin

How Average Works

Second Place

One Way Rivalry

3rd Year Group 3 of Aoba High School

Deepen Friendship, Deepen Misunderstanding

Lunch Break at the Cafeteria

Endless Conflict or Being Alone?

Adult's Point of View

Black

Degeneration

Falling Down

A Piece of Sweet Reward

Overlap

Breaking Down

I was Waiting

The Correct Answer

I Won't Run Away

Smiling Face

Reality ≠ What is Correct

Golden Week

I'm Coming In~

Unconcerned

No Evil Intent

Just the Two of Them +1

It Wasn't Our First Meeting

Legal High School Girl?

Hiatus Notice/Biography

Let's Redo it Properly, Kaizaki-kun

52.5 We're Not Making Fun of You~☆

Listening to Your Explanation

Distance Dilemma 2

Love Talk With Friends

Staff Room After School

Timid But Exceptional Person

A Loveable Awkward Girl

Strong and Diligent Person

Before the Storm

Being Impatient

The Result of an Accident

I Want To Go Back in Time

Insensitive Hishiron

Corrosion

Around the Crack

I Really Hate This Kind of Girl

68.5 Strange Situation

HELLO

Last Year's Trauma

Revenge

Step by Step, Together

All Meeting in One Building

Honoka's Feelings

Chizuru's Feelings

Rena's Feelings?

Suffocating Intersection

Final Assault

This Stubborn Girl

Rena's Feelings

Connected

Moving On

83.5 The Tranquility After The Big Event

Expressing Gratitude

First Anniversary of Death

I Have to Support Him

A Trip Through The Past

Sense of Loss

Admiration for our Senpai

Facing Forward

All in this Together

Girl's Feelings Lead to Curiosity?

End of the Semester!

When the responsibilities of being an adult and the ugly side of corporate bullying betrays one's childhood dreams, many would wish to return to their innocent childhood to relive their life and make the right decisions. Dumbfounded by the offer presented to him, 27-year-old Arata Kaizaki hopes to turn his life around through a once-in-a-lifetime opportunity.
 
Returning home from his part-time job, Arata is persuaded by Ryou Yoake, an employee of ReLife Research Institute, into participating in an experiment which will help him overcome his difficulties and re-enter corporate life. As part of the ReLife experiment, Arata's physique is reverted to that of a 17-year-old, and all he must do is relive his high school life for one year. Waiting for him at the end of the experiment is a job offer that he has been struggling to get ever since he left his first company.
 
With few other options, he decides to go along with this plan. However, with adult-like tendencies and many years since his last formal education, Arata steps into an unexpectedly challenging territory—a normal day of high school.
 (Source: MAL Rewrite)
 Note: Includes 16 extra chapters