https://mangadex.org/title/c6c428b5-b8e4-42f6-8777-8f548f45e79d/isekai-meikyuu-no-saishinbu-wo-mezasou
It's this one. But the novel had gone far though. Everyone is insane and gaslighting themselves in that series.
This motivation reminds me of Ragne from Dungeon Dive. She wanted to become number one (ichiban), but when she reached it like became the number one knight, she would give herself a new meaning of number one. Like the number one Saint or whatever. Until, at one point, she became the strongest in...
Yah. It's truly Godzilla reference. Honestly I kinda pissed off at Same for hurting Shiromi with his move. But I guess he knows that Shiromi is just kinda build different.