The Girl I Saved on the Train Turned Out to be My Childhood Friend(2020)

Chikan Saresou ni Natteiru S-kyuu Bishoujo wo Tasuketara Tonari no Seki no Osananajimi datta

As children, Ryou Takamori and Hina Fushimi were thick as thieves-but while Hina grew more beautiful and popular, Ryou faded into the background as a loner, and the two drifted apart. That is, until the morning Ryou saves Hina from a groper on a train and unwittingly reminds her how close they used to be. Now Hina is smitten-if only Ryou weren’t so oblivious!

(Source: Yen Press)