Gokinjo JK Isezaki-san wa Isekai-gaeri no Dai Seijo

One day, Matsunaga, an office worker in his 30s, is stabbed by a thug while protecting Seina Isezaki, a high school girl who lives nearby. At the moment when Matsunaga's life is about to end, Seina's body somehow begins to glow, and she revives him from near-death injuries with her mysterious power