There is very little fanservice in this anime, though periodically there is awkward, implied nudity and some mild sexual tension that takes place in characters over-dramatic conversations.

Ep. 1: A man is seen naked from behind, and from the front, though strategically placed objects obscure his groin from view. This takes place in front of a highschool aged girl, who is visibly uncomfortable. This's a prolonged encounter as the man proceeds to fight a battle while naked.

Ep. 4: A man takes a bath, he is seen naked briefly, though with strategically placed objects to obscure the groin. Later he flashes a girl to show that he's wearing a loin cloth, played out for commedy.

Ep. 3: A man squeezes a girls breast to make her release him in a fight.

Ep.4: A man is confused and fascinated by a female mannequin in underwear. A young girl is embarrassed as she tries to purchase a loin cloth.

Ep. 5: A boy attempts to take a picture up a girl's skirt, nothing is seen.

Ep.7: A teacher wears a revealing swimsuit, attention is drawn to her ample cleavage. High School girls wear revealing bathing suits during swim class and this angers a samurai who's also wearing nothing but a loincloth.

Ep. 8: A girl dresses in a school uniform, underwear is briefly seen from behind.

Ep. 12: A girl's underwear is briefly seen while being given a strange massage by another girl, not sexual in nature. Several images are shown of a girl in a revealing cosplay outfit, boys save the images with ominous intentions.

Ep. 13: Implied nudity of a woman is seen on the cover of what's clearly a pornographic magazine.

Season 2:

Ep.16: Two Characters dress in revealing outfits for cosplay reasons, one comments that one of them has large breasts.

A character is ribbed that he edits pornographic movies from his collection

Ep.18: Several women and a man are seen naked in separate spas or holding towels, only cleavage is visible.

Ep.20: A girl's midrif is seen when she wears rags of sort to cover herself as improvised clothing. She eventually replaces them with proper clothing that's a skin tight jumpsuit.

At some point a man comments that he will dance naked for a video and several girls become excited at the prospect.

In general, this series has a surprisingly small amount of actual combat, but in general:

Giant robots battle in dramatic environments

Robots from space crash into Earth in a dramatic Raid

Robots expel red fluid similar to blood when damaged

Mild hand to hand combat takes place frequently

A man battles giant robots with nothing but a sword, cutting off limbs and impaling them

A man is fitted with an electric shock collar that is comedically triggered to paralyze him at various times

Some more detailed scenes include:

Ep. 7: A mother slaps her daughter in an argument, it's an emotional scene.

Ep 8: A father punches his son in front of a teacher in a shocking display of verbal and physical abuse, though there are no repercussions for the act, and it's tacitly treated as accepted behavior.

Ep 10: A man is kicked by a robot, and begins to bleed where he lands.

A man breaks his own hand to escape being a captive

A man's neck is broken by another man's bare hands

Ep. 11: A man is impaled by a sword, blood drips down the blade.

A man is shot repeatedly by a machine gun

Bodies are seen in pools of blood

Two Samurai battle with swords, one is impaled before falling and making a bloody impact

Ep13: A man is impaled by a sword, a small amount of blood is shown.

Season 2:

The action picks up in season 2, but is overall less graphic than the first season. A handful of people are stabbed and slashed with knives and swords.

Ep. 14-15. A man coughs up blood and bleeds from wounds, getting blood on his hands and on others.

Ep 26. A character is impaled on a sword and a prolonged discussion takes place with him while the sword is sticking out of him, some blood is seen.

Mild profanity is found in a handful of episodes while others have none at all. Most of the profanity comes from a single character, who is noted as being vulgar by other characters.

Subtitles: Profanity includes: H*ll, Piss, B*tches, dumb a*ss, Sh*tholes, B*st*rd, A*s, D*mn, crap, Jesus and God are used as cuss words on one occasion

Women are called "wench" on a couple of occasions as a derogatory term. Ep. 2: A man comments that he will split someone's head open and take a dump in it. Ep.7: A man calls a girl a pig to be eaten and tells her to get eaten and die.

Frightening Scenes:

A painting is seen more than once depicting giant, horned, ogres destroying a village that is on fire

Ep 2. & Ep4. There is a brief flashback of a blurry battlefield littered with bodies, some blood

Ep. 10 A Man remembers a battlefield shown with bodies and mild amounts of blood

An enemy is often reflected on with armour that is intended to be scary looking, it may disturb young viewers

Season 2:

Aliens invade a complex and named characters are subjected to some kind of mind control that makes them behave like zombies. This may be intense for younger viewers.

A girl is kidnapped in a rather emotional scene

Some younger viewers may find the cactus robots with their glowing eyes and pointy exteriors to be scary.