Ring of Promise

Unlike real life, Max is pretty good at playing games, so when a new limited time dungeon opens up in the virtual reality game he plays boasting a huge cash prize, Max knows he needs to try and complete it if he wants to be able to pay rent this month. Fortunately, the only guild strong enough to attempt to take it on before the timer runs out needs a tank. There's just one problem, he's never played with them before, and even if he convinces the Sisters of Artemis to let him join in time to tank the dungeon and collect the prize money, if they wipe, it's all over. That would be bad because without that prize money, both he and his baby sister will be sleeping in a cardboard box under a bridge, and Max really hates sleeping in cardboard boxes. Been there, done that, sold the T-shirt.