
Hard-Boiled is the manga's tenth chapter, set during the Amusement Park Arc. Inside a haunted hospital attraction, Boiled and Obiguro strike, and a flashback reveals the childhood friendship between Boiled and Taro that curdled into a lasting grudge.
The group picks its way through a haunted hospital attraction and is set upon by what looks like a zombie, though Shin and Taro quickly recognize it as an assassin in disguise and deal with it. From a surveillance room, Boiled and Obiguro watch the action. Obiguro is eager to see Taro fight but happily leaves him to Boiled, who drains a bottle of liquor and flatly denies that Taro is any friend of his.
A flashback fills in their history. At the JCC assassin training school, a fifteen-year-old Boiled sought out the famously strong fourteen-year-old Taro, and the two grew close. The bond frayed one Valentine's Day, when Boiled assumed neither of them was the sort to receive chocolate, only for the popular Taro to be showered with gifts, convincing Boiled they were nothing alike.
As Taro and Shin cut down assassin after assassin, a frightened Lu downs what she calls a family remedy, which Shin realizes is just alcohol. The tipsy Lu opens a door and unleashes a horde of zombies. Boiled crashes in and sends Taro flying, and Taro flings an ID card that nicks the old scar on Boiled's cheek. Obiguro squares off with Shin, only for the drunk Lu to kick her in the face.
Boiled and Obiguro make their move against the family inside the attraction. Taro fails to recognize Boiled and instead asks after his family, deepening the old wound.
The chapter ends with the fights breaking into pairs: Taro against a tearful, determined Boiled, and a newly excited Obiguro against Shin and a drunken Lu.

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The tenth chapter falls within the Amusement Park Arc and the second collected volume, running nineteen pages. It was published on February 8, 2021.
Its cover features Sakamoto, Shin, Lu, Aoi, and Hana, and the flashback introduces the childhood tie between Boiled and Sakamoto.
The chapter title "Hard-Boiled" is a play on the character Boiled, who is reintroduced in this chapter alongside a flashback revealing his childhood bond and falling out with a young Taro Sakamoto.
Obiguro is the character who appears alongside Boiled in Chapter 10, watching the group from a surveillance room before later fighting Shin directly.
No, Sakamoto does not remember Boiled in Chapter 10; when the two come face to face he fails to recognize his old friend and instead asks after his family, deepening the wound between them.
Boiled and Sakamoto first bonded at the JCC assassin training school, where a fifteen year old Boiled sought out the famously strong fourteen year old Taro. Their friendship soured after a Valentine's Day when the popular Taro was showered with chocolate while Boiled received none, convincing Boiled they were nothing alike.
In the haunted hospital attraction, Boiled crashes in and sends Taro flying while Obiguro squares off against Shin, until a drunk Lu, who mistakenly drank alcohol thinking it was a family remedy, kicks Obiguro in the face.
Looking for more on Chapter 10: Hard-Boiled? The Sakamoto Days Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the Sakamoto Days anime series, manga, and official materials. Sakamoto Days was created by Yuto Suzuki, published by Shueisha, and animated by TMS Entertainment. All rights to Sakamoto Days and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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