For You in the Concave and Convex World, I Can Do It

[Two male protagonists] + [A little yandere] + [Travel without system] + [The protagonists are both super strong] Since this is the author's first time writing, there may be typos, and my writing style is not very good, so just don't criticize it, and don't give it a high rating, just don't belittle it. The following is the plot↓↓ This is a double male protagonist novel, Yaz and Ulan are both boys! Boys! Boys! It's just that Yaz is very girl-like [appearance + voice], she looks like a half-royal sister, and her voice can be switched at will. I'll mark it when switching. At other times, it's shota voice, and Ulan's voice is a little more steady. The two of them were playmates when they were young, Yaz was an orphan, and Ulan had only one grandma. Then the two of them met and became good friends. The grandma had no money to send them to school, but they both had very good fairy voices. Talent scouts discovered them and made them big stars. The road was very bumpy. Grandma was also seriously ill and needed a lot of money, but fortunately they got through it together. They had a contract with the company. After the last performance, the company's contract with them ended. The two of them were very happy. They had saved money in the past few years, and grandma's condition was about to recover. After the last performance, they could pick her up and be discharged from the hospital. However, they did not expect that an accident occurred during the last performance... "No... Don't leave me..." "I... We can finally... Can..."