Straine Proposes 'Shampoo Switching' as a New Habit for Hair Concerns During the Rainy to Summer Humid Season, Hosting a Sampling Event at Lumine Yurakucho on June 20 and 21

Straine (Storain), a straight haircare brand operated by Ai Robotics Co., Ltd., will host a sampling event on June 20 (Sat) and 21 (Sun) at Lumine Passage, Lumine Yurakucho, to promote the new habit of 'shampoo switching' in response to hair concerns during the hot and humid season from the rainy period to summer.

This event proposes a new routine of reviewing your shampoo and haircare regimen according to seasonal hair issues, especially during times when humidity and sweat make hair frizzy, wavy, or difficult to manage.

By distributing Straine's shampoo and treatment products—specifically formulated for straight hair—visitors can experience how to choose the right haircare for the upcoming season, delivering a tailored straight-hair care experience that addresses rainy and summer season concerns.

Peak rainy season! Introducing 'shampoo switching' as a new habit for the season when humidity and sweat make hair hard to manage

A two-day sampling event offering two hair-type-specific lines: 'BASIC' and 'SOFT'

Straine is a haircare brand specialized in the scientifically developed 'Straight Formula*' that focuses on the internal structure of hair, inspired by curly hair repair. It offers two lines: 'BASIC' for normal to thick hair and 'SOFT' for fine hair, targeting different internal structures based on hair thickness.

The hot and humid season from the rainy period to summer is when hair becomes particularly difficult to manage due to moisture and sweat. This is precisely the time when it's important to reevaluate your haircare—not just through styling, but also by switching your daily shampoo and conditioner.

As a special initiative to let more people experience Straine, a two-day limited sampling event will be held at Lumine Passage, Lumine Yurakucho. Trial samples will be distributed, each containing one use of shampoo and treatment for both 'BASIC' and 'SOFT'. Trying both allows guests to find the best haircare match for their hair type and desired finish.

Additionally, at Lumine Passage, Yurakucho, large visuals of brand ambassador Tomohisa Yamashita will be displayed. A special event-only space will be prepared where visitors can immerse themselves in the brand's world while receiving their trial samples. As the rainy season transitions into summer, we invite you to experience Straine's straight haircare as a new solution for seasonal hair concerns.

【Event Overview】

Event Period: June 20 (Sat) – June 21 (Sun), 11:00–18:00

Location: Lumine Passage, Lumine Yurakucho / 2-5-1 Yurakucho, Chiyoda-ku, Tokyo

Sampling Content:

Straine trial size (one use each) + leaflet

- Straight Shampoo & Treatment [BASIC] – White Blossom Scent, 10mL

- Straight Shampoo & Treatment [SOFT] – Berry Blossom Scent, 10mL

* Sampling will end once supplies are depleted.

* Content is subject to change without prior notice.

Product Overview

Available since April 1, 2026 (Wed) at drugstores, variety stores, and EC malls.

Straight Shampoo/Treatment [BASIC] – For Normal to Thick Hair

[Capacity / Price]

Regular 475mL / ¥1,980 each (tax included), Refill 400mL / ¥1,540 each (tax included)

One-time trial set (shampoo & treatment) 10mL / ¥165 (tax included)

[BASIC] for normal to thick hair delivers a flexible, manageable finish. It softens hair prone to stiffness and frizz, creating a smooth, cohesive texture. Daily use improves the hair base, making styling and updos easier.

Straight Shampoo/Treatment [SOFT] – For Fine Hair

[Capacity / Price]

Regular 475mL / ¥1,980 each (tax included), Refill 400mL / ¥1,540 each (tax included)

One-time trial set (shampoo & treatment) 10mL / ¥165 (tax included)

[SOFT] for fine hair features the 'Straight Nano Shot Formula*'—ingredients refined to the nano level to match hair texture. Enhanced penetration helps control waviness while maintaining lightness, resulting in a bouncy finish with volume, resilience, and strength.

* Hair repair

Brand Ambassador Profile

Tomohisa Yamashita (Yamashita Tomohisa)

Born in 1985, Chiba Prefecture. Began entertainment career in 1996. Active across music, dramas, films, and commercials. Recently expanded acting work overseas; his lead role in 'Drops of God' (Japan-France-US co-production) won the International Emmy Award for Best Drama Series. In 2026, he returns to Japanese cinema with the film adaptation of 'Honest Real Estate' after an 8-year hiatus. A world tour titled 'DREAMING' is scheduled to begin in autumn.

Haircare Brand 'Straine'

Named by combining 'straight' and 'line', Straine is a haircare brand dedicated to the 'Straight Formula'—developed through deep research into hair structure, returning to its essence and origin. Using carefully selected repair ingredients and a unique repair design technology focused on internal structure, Straine offers everyone struggling with curls and waviness a chance to meet their new self. Currently offering two lines by hair thickness: [BASIC] for normal to thick hair and [SOFT] for fine hair. We propose long-term, daily haircare for naturally straighter hair. X: @straine.jp Instagram: @straine_official

* Refers to a smooth, straight texture with a cohesive feel

Company Overview: Ai Robotics Co., Ltd.

With the corporate philosophy of 'Creating New Freedom,' the company continuously launches brands using AI technology. Currently operating major brands including the haircare brand 'Straine (Storain)', skincare brand 'Yunth (Yunsu)', and beauty appliance brand 'Brighte (Bright)'. Product lines are continuously expanding.