Swim in the Dark. Book 1

Tomioka is already over thirty. He works as a night watchman in a small-town shopping center. Alone. And he lives alone too. And his solitude didn't bother him at all... until recently. What to do when the familiar way of life starts to frighten him? Tomioka notices that someone is watching him, and threats are coming to his workplace. So many problems and so little experience, what should he do? Perhaps it’s time to finally wake up from a long sleep and find himself... a couple of friends? It doesn’t matter how many bumps he’ll have to endure along the way, as the world seems to be pushing him toward this.

Book 1 includes the first and second volumes of the manga.