Gaist Crusher

Gaist Crusher is a media mix franchise created by Capcom that launched in 2013, with an anime series airing from 2013 to 2014.

Set in the year 2064, it has been a few decades since the rare metal ore "Gaimetal" was discovered by humanity. Possessing large amounts of energy, the ore is in great demand worldwide but it has also caused humans to be constantly attacked by the Gaist, a race of rampaging creatures whose bodies are encrusted with Gaimetal. To combat this threat, the organization Gaist Crusher Garrison or CGC was formed, handling fighters called "Gaist Crushers" as they wear special armor made from Gaimetal.

Rekka Shirogane is an average middle school student who would love to become a Gaist Crusher, and gets an opportunity to do so when he is forced to don the armor to defend his friends when they get caught during a Gaist attack. While he fails the entry exam after being invited by the GCG, Director Vulcan sees his potential and approves him to become an official Gaist Crusher. Rekka soon teams up with other young teenager Gaist Crushers like himself, and they work together to battle the Gaist and oppose the organization called "Erasers" that threatens to wreck havoc on the world.

OP
Kurama's shirt slightly exposes his waist.

Episode 3
Rekka takes a bath.

Episode 5
Kurama appears for the first time.

Episode 6
Kurama looks to the side.

Episode 8
Kurama talks to Rekka and Hayato, and Rekka's shirt flies up.

Episode 9
Kurama sits down, and Hayato sleeps shirtless.