One way to get more rings in High School Story is by interacting with other characters and building strong relationships. Sometimes, they'll give you rings as a token of appreciation. Also, keep an eye out for special events or limited-time offers that might offer extra rings as rewards.
You could try completing more challenging tasks or quests within the game. That often rewards you with rings.
To get more rings on High School Story, you need to be active and participate in various activities. For example, attending parties, joining clubs, and achieving high grades in school can all lead to earning more rings.