Correct grammar and spelling errors, and add necessary punctuation.

When Akihiro was 7 years old he decided to go swimming in a lake with his father, Akihiro told his father that he could not hold his breath for too long under water and that scared him, his father explained him that the fear he felt made his heart go faster causing the oxygen in his body be consumed faster, and if he wanted to maintain his strength he needed to stay focused, calm but consistent.

When Akihiro was 7 years old, he decided to go swimming in a lake with his father. Akihiro told his father that he could not hold his breath for too long underwater, and that scared him. His father explained to him that the fear he felt made his heart beat faster, causing the oxygen in his body to be consumed faster. He also told him that if he wanted to maintain his strength, he needed to stay focused, calm, but consistent.

The same with this if there needs to be.

The user remains in a state of extreme relaxation and realizes several fast-as-flash slices.

The user remains in a state of extreme relaxation and realizes several lightning-fast slices.

The user "dances" with the enemy's attacks deflecting them and causing damage to the attacker, this works even if the attacks are unpredictable, the user can keep this "dance" for a short period of time but at the high cost of boiling their blood.

The user "dances" with the enemy's attacks, deflecting them and causing damage to the attacker. This technique works even if the attacks are unpredictable. The user can maintain this "dance" for a short period of time, but at the high cost of boiling their blood.

The user swings his weapon around creating an illusion of a green wall blocking the enemies sight and protecting the user.

The user swings his weapon around, creating an illusion of a green wall that blocks the enemies' sight and protects the user.

The user moves in a flow that limits the opponent movements (This form is more effective with Akihiro's next move guess ability)

The user moves in a flowing manner that limits the opponent's movements. This form is more effective when combined with Akihiro's ability to anticipate the opponent's next move.

The user throws one or several wisteria smoke bombs and attack freely within its range (Using the cell breathing gives momentary immunity to the wisteria smoke).