Isekai Series #48,763, the obnoxiously titled I’ve Been Killing Slimes for 300 Years and Maxed Out My Level, starts out super-dark (albeit tempered with kiddy art) with its workaholic protagonist Aikawa Azusa literally dying at her desk. She encounters an angel in heaven who reincarnates her as an immortal in some nice relaxing highlands.
Azusa is pleased with her forever-17 looks and witch getup—complete with a hat big enough to make Elaina blush. She’s also glad that the only enemies in these lush, verdant highlands are harmless slimes, which she decides to defeat at the rate of ~25 per day in order to fund her knew laid-back life.
Azusa goes on to live a slow, peaceful life in her secluded cottage, tending her field, making medicines from herbs, and basically just kicking back…all while defeating around 25 slimes a day, exchanging the crystals they drop for coin at the nearby village’s adventurer’s guild. This goes on…for three hundred years.
Before she knows it she’s the oldest and most venerable person in the village. The episode intentionally underplays this massive passage of time, comprising over three average human lifespans, but also underscores just how badly Azusa needed a long, long vacation from her hellishly busy past life.
When a guild clerk checks Azusa’s stats for the first time in three centuries, they learn she’s reached Level 99—slow and steady truly has won the race. When rumors spread of the power of the “Witch of the Highlands”, adventurers visit her wanting to test their skills against the best.
Of course, Azusa doesn’t really want to engage in such sparring, any more than she wanted to make a name for herself. She’s always been content to live her slow, peaceful life. But when the adventurers insist, she quickly dispatches them without breaking a sweat, and before she knows it a big red dragon is at her door, looking for a fresh challenge.
A short but sweet aerial battle ensues, with Azusa easily countering the dragon’s fire breath with her ice magic, which she then uses to fuse the dragon’s mouth shut. It plummets to the ground and then does exactly what Azusa had hoped it wouldn’t do: trash her beloved house, which in 300 years had gotten just the way she liked it.
Adding a slug to the face for good measure, Azusa makes the dragon promise to fix her house up, and it sheepishly departs to collect the gold it’s been hoarding in its mountain lair. Azusa’s seiyu Yuuki Aoi carries the episode with her highly versatile voice that darts from charming and sweet to annoyed and threatening at the tip of a giant witch’s hat.
While her house is in ruins, Azusa stays at a complementary guest room at the village office, and due to all of the goodwill she’s earned from the villagers and their descendants—from staunching a plague to protecting them from the red dragon—she never has to pay for a room, a drink, or a meal in that village ever again.
Azusa is surprised then, when a cute redhead with horns pays her a visit the next day and introduces herself as Laika, the red dragon she defeated. Laika has brought the gold, and begs Azusa to let her be her pupil. Azusa isn’t sure what she can teach her, but she does like the sound of someone to do all the housework, so she agrees. Laika gets to work building a larger dwelling from scratch that will accomidate them both.
When the sun begins to set, Laika assures her new master that she can work through the night to finish the house, but Azusa takes her face in her hands and delivers a “hard no” to that offer. As someone who literally died from working too hard, she’s not about to let her pupil threaten her health by doing the same. Too often “working hard” is overused in a positive light.
Instead, she tells Laika to watch the darkening sky, which is telling them she’s done enough for the day. That said, Laika is incredibly industrious, and the new larger house they’ll share is soon completed. Rather than kick Laika into the kitchen to make supper, Azusa takes her by the hand and they head into the village to celebrate.
While I wish Slime 300 had a more imaginative title, I am glad slimes were more of a means and not an end to Azusa’s story. I find her dedication to living a quiet peaceful life quite admirable, and it’s a nice contrast to more ambitious witches like Elaina, who starred in an more ambitious but ultimately uneven series.
By comparison, Slime 300’s wonderfully simple plot, lush idyllic land-and-townscapes, competent magical combat, and the all-star voices of Yuuki Aoi and Hondo Kaede (Maple from Bofuri) make it well-positioned for a low-stakes, high-comfort isekai viewing experience. It also featured more frequent and effective comedy and a more interesting heroine than The Saint’s Magic Power is Omnipotent, so if I end up picking only one to watch, 300 has the early edge.