Takami no Takami-san

Arai is a former high school teacher who has started working at a building cleaning company. When he is assigned to work on skyscrapers, his mentor is a young woman, Takami-san. Though afraid of heights, he ventures out in the gondola anyway — but working alongside Takami-san is only making his heart-rate race even faster...? (Source: Tonari no Young Jump, translated)