Anyway, I'm Falling in Love With You. 11

Two young men who have been holding back their feelings for so long… After reuniting in 2030, Shin throws down the gauntlet to Kizuki, declaring that he won't let him have Mizuho. Driven by his overwhelming feelings for Mizuho, Shin makes a move…?! Meanwhile, Shuugo makes his own declaration of war and asks Kizuki to compete against him for Mizuho's heart! Kizuki decides to swim again, and vows to win Mizuho back. With Mizuho at the center, the friends reignite their youthful passions that had been frozen in time!

Volume 11 of the Anyway, I'm Falling In Love With You manga series by Haruka Mitsui.