Isekai Ojisan

Synopsis

Yousuke buys an issue of the last ever SEGA magazine and is disappointed the most popular game was a Bishoujo game and his favourite Guardian Heroes only made it to 197th place. He reveals he hates RPG games as he can never follow the story, revealing that once he was supposed to cure the broken heart of an Ice Witch named Mabel to get an ice sword to defeat a fire dragon, but he forgot, so he killed the dragon without the sword and left Mabel to her misery. On New Years Eve, Yousuke shows his memories of Mabel coming to his room, impressed by his bravery and wanting to know how to stop being a coward. Completely unaware of what she actually wanted he told her cowardice is fine, convinced her to become a NEET, and even turned down her offer of the ice sword because he "doesn't like cold things". Takafumi bumps into Sumika Fujimiya, a girl he hasn't seen since childhood. Fujimiya sees Yousuke chanting spells and believes he is crazy and taking advantage of Takafumi's generosity. Despite Yousuke reading her mind, Takafumi proves he is almost as dense as Yousuke as he believes he and Sumika are just friends. Sumika is so infuriated by their unusual living arrangement she decides to do something about it.

(Source: Wikipedia)