Shinyuu to H Shite Mimashita

Takahiro and Kei are in a relationship after Takahiro confessed his feelings, though it's clear Kei isn't fully committed. Their physical intimacy is limited due to a painful first attempt, which Kei has refused to repeat. Despite this, Takahiro is determined to convince Kei to give it another try, going as far as vowing to win a marathon to prove his dedication.