S Rare Soubi no Niau Kanojo
Sレア装備の似合う彼女
A high school sophomore named Seko Daiko is known for his extreme frugality, going to great lengths to save money, such as removing light bulbs and making his siblings eat bread crusts. He believes he can maintain his thrifty lifestyle indefinitely until he discovers that the fate of the world hinges on him spending money on a mobile game. The manga consists of 50 standard chapters and 12 additional ones, with some chapters split into multiple parts.