Ikemen Sengoku: Tenkabito no Onna ni Naru Ki wa Nai ka

After successfully getting hired as a fashion designer, Mai rewarded herself with a trip to Kyoto and was just enjoying herself when she got struck by lightning at Honnouji temple. She then loses consciousness awaking only to find the temple ablaze. In the spur of the moment, she saves a person from being attacked, but it turns out he's Oda Nobunaga?!

(Source: Akita Shoten, translated)

Ikemen Sengoku is a free-to-play Android/iOS otome game developed by Cybird, available in Japanese since June 22, 2015 and in English since June 30, 2017.