Kazuma stomps, he can absorb energy even speed making Naruto even in his cloke close to useless up close:
Ichigo and Naruto's ranged attacks are useless too since Kazuma can alter his body to reflect attacks as seen here where he reflects light (Take it as you will, it was the guy's Alter ability so you guys can argue if it is lightspeed or not, I'm just trying to show that he can reflect attacks.)
Despite being so far away I see that only working in Kazuma's favor, in his later for (The distance should give him more than enough time to transform and one should note that he retains all his abilities from other forms.) Kazuma in his 3rd form punched and killed Galan Du with sufficient force to fire its effect as a beam of energy escaping into outer space and still form a crater hundreds of meters wide on the ground. Keep in mind this is a PUNCH
And even if Naruto uses a Biju bomb it will get reversed by Kazuma's effect reversal which is a highly potent ability of "Death Bullet" it has the power to "reverse" the position or nature of any physical or energy-based ability with physical contact as seen when he reversed the lens of Aono's "Shield of Distortion" so that the magnification process minimized from Aono's position and maximized on Kazuma's.
Not to mention that if all else fails, he has time travel BFR
Leep in mind he managed a country busting attack and sent someone back in time with a hole in his chest
And in case anyone ask, yes he can come back after he sends you back in time:
Keep in mind that attack wiped out the dinosaurs as the narration stated his alter made it possible for humans to evolve as he traveled to the past fighting the main villain, the collide create a explosion that causes a huge crater in the ground, and the narration says that Kazuma's alter was what caused man to be able to evolve from that attack. Keep in mind this is BEFORE his fight in space if I remember correctly, Kazuma can fly and breath in space in his final form as well. This is a stomp in Kazuma's favor, he one shots all of them, arguably without his final form, he is a hypersonic country buster with regen and fought against someone who could slash diamonds.
Kazuma stomps this.