Tsubasa Tanuma

Name: Tsubasa Tanuma

Gender: Male

School Year: Second-year Class B → Third-year Class A in high school

Club: Volunteer Club

Birthday: August 25

Blood Type: A

Family: Has a younger sister

Father: Director of a hospital

Grandfather: Tanuma Shouzou

Children: Becomes a father at 17 while still a student

Tsubasa is the son of a hospital director, placing him in a well-off and socially respected family.

His grandfather is Tanuma Shouzou, a fact that is only hinted at for most of the story and becomes explicit later in the series.

For a long stretch of the original work, his actual name is not revealed.

Up to chapter 99 (chapter 109 in the collected volumes), and even through both seasons of the television anime, he is simply credited as “Kashiwagi’s boyfriend.”

He also has a younger sister, though she does not play a central role in the main narrative.

Despite his prestigious family background, Tsubasa’s personal story focuses more on his love life and growth than on status.

Tsubasa is a student who moves from Second-year Class B to Third-year Class A as time progresses.

He belongs to the Volunteer Club, showing that he participates in school activities beyond just academics.

Initially, he is not portrayed as an outstanding student.

However, his academic performance improves significantly after he starts dating Nagisa Kashiwagi and receives study help from her.

Because Nagisa is one of the top-performing students in their year, she tutors Tsubasa.

With her guidance, his ranking in school tests rises, reflecting both his effort and their supportive relationship.

Tsubasa’s defining storyline centers on his romance with Nagisa Kashiwagi.

He first approaches Miyuki Shirogane to ask for advice about confessing his feelings to Nagisa.

Miyuki responds by devising a dramatic “wall slam” confession strategy, sometimes referred to as a “wall daan” style move.

Using this method, Tsubasa successfully confesses to Nagisa, and the two officially become a couple.

After they start dating, Tsubasa continues to visit the student council room to seek further love advice.

Over time, his visits shift from nervous questions to cheerful bragging about his happy relationship.

By the time the summer vacation ends, Tsubasa’s appearance becomes more flashy and somewhat frivolous-looking.

His increasingly smug and lovestruck stories begin to annoy the student council members, who feel he is overdoing the boasting.

Despite that, his relationship with Nagisa remains strong.

They move from a cute high school romance into a very serious commitment at a surprisingly young age.

Early on, Tsubasa comes across as earnest, nervous, and rather plain.

He is insecure enough about love to seek help from Miyuki, but brave enough to act once he has a plan.

As his relationship with Nagisa deepens, his confidence grows, sometimes turning into overconfidence.

This change is reflected both in his lighter, more playful look and in his tendency to brag.

Tsubasa is not portrayed as a genius, but he is willing to work hard, especially when motivated by Nagisa.

The improvement in his grades thanks to her tutoring shows that he takes both his studies and his relationship seriously.

His story arc adds a more realistic and grounded dimension to the series’ focus on love.

Instead of mind games alone, his life shows the consequences of real choices and responsibilities.

One of the most striking developments in Tsubasa’s storyline is that he gets Nagisa pregnant while they are still in school.

As a result, Tsubasa becomes a father at the age of 17.

This continues a family pattern: he is the third generation in his family to become a father at 17.

The narrative emphasizes this as a notable, almost legendary streak in the Tanuma family.

His early parenthood adds a serious and dramatic layer to what initially seemed like a typical high school romance.

Tsubasa’s character thus bridges lighthearted romantic comedy with themes of responsibility and growing up far earlier than most of his peers.