Yui and Yu make an appearance at a café in Ikebukuro in brand-new illustrations featuring maid and waiter outfits!
A collaboration café based on Yoshimizu’s manga *My Little Sister Finds Her Brother’s Obsession with Her Annoying* will be held from August 25 to September 13, 2026.
The event will be held at Patio de METRO in Etica Ikebukuro to commemorate the release of Volume 6 of the manga.
The collaboration menu is inspired by the food featured in the manga, featuring a total of four food items—such as “Spicy Kimchi Doria: Something I Want to Eat with Yui”—and five drinks.
Customers will receive a coaster with every food or drink order, and for every 3,000 yen spent on merchandise, they’ll receive a character card.
Reservations are not accepted; customers must visit the venue directly.
・The venue is Patio de METRO Etica Ikebukuro, and the event runs from August 25 to September 13
・As part of a promotion to celebrate the release of Volume 6 of the manga, the event will feature newly drawn illustrations of the characters dressed as waitstaff
・Four collaboration food items and five drinks will be available; customers will receive a coaster with every item ordered
・The coaster designs will change between the first half (11 designs total) and the second half (8 designs total)
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“My Little Sister Is a Hassle” Collaboration Café Opens in Ikebukuro!
A collaboration café based on Yoshimizu’s manga *My Little Sister Is a Hassle* is opening.
This event commemorates the release of Volume 6 of the manga series and features newly drawn illustrations depicting Yui and Yu serving customers.
・Event Dates: August 25–September 13, 2026
・Hours: 9:00 AM – 9:30 PM (Last order for collaboration food is at 8:30 PM)
・Venue: Patio de METRO Etica Ikebukuro (Directly connected to the B1F of Tokyo Metropolitan Theatre, 3-28-14 Nishi-Ikebukuro, Toshima-ku, Tokyo)
・Access: Ikebukuro Station Exit 2b
・Details: Collaboration menu items, sale of collaboration merchandise, and various purchase bonuses
No reservations are accepted; customers must visit the store in person.
©Yoshimizu/Ichijinsha
The collaboration menu features 4 food items and 5 drinks
The menu features items inspired by the food in the series.
The menu items are named after the characters, and each food item comes with a card featuring an original illustration.
©Yoshimizu/Ichijinsha
Food & Desserts (4 items total)
The menu features 3 main dishes and 1 dessert.
・Spicy Kimchi Doria I’d Love to Eat with Yui: 1, 600 yen
・Mahiro’s Grandma’s Special Lunch: 1,400 yen
・Basil-Scented Margherita We Ate at the Study Group: 1,400 yen
・The Strawberry Parfait Yu Wanted to Order: 1,300 yen
・*All prices include tax
“Mahiro’s Grandma’s Special Lunch” is a Japanese-style platter featuring a variety of dishes such as croquettes, rolled omelet, and kinpira.
Drinks (5 items total)
There are 5 drink options, each priced at 950 yen (tax included).
・Yu’s Lagoon Blue Soda: 950 yen
・Yui’s Kiwi Smoothie: 950 yen
・Mahiro’s Berry Rouge Soda: 950 yen
・Koyuri’s Strawberry Milk: 950 yen
・Subaru’s Violet Soda: 950 yen
・*All prices include tax
Each drink is served with a drink tag featuring an illustration of the character.
Collaboration Coaster as a Bonus with Food Purchases
For every collaboration food or drink item ordered, you will receive one collaboration coaster as a gift.
The designs will alternate between the first and second halves of the promotion.
・First Half (August 25, 2026 – September 3, 2026): 11 designs total
・Second Half (September 4–13, 2026): 8 designs total
・*Designs cannot be selected
・*Since coasters are distributed at random, you may receive duplicate designs
・ *Offer ends when supplies run out
・*Merchandise purchase bonuses are not included with food and beverage orders
©Yoshimizu/Ichijinsha
©Yoshimizu/Ichijinsha
There are 9 types of collaboration merchandise in total
Products featuring newly drawn illustrations of the characters in waitstaff outfits will be available for purchase.
Purchase limits have been set for each product.
©Yoshimizu/Ichijinsha
Exclusive acrylic stands, keychains, and more
Items available for purchase with your choice of design. There is a purchase limit of 3 per item for each design.
・Exclusive Acrylic Stands: 4 designs total / 1,980 yen each
・Acrylic Keychains: 4 designs total / 1,100 yen each
・Sticker Set: 4 varieties total / 1,100 yen each
・Mini Towel: 1 variety / 1,430 yen
・Pouch with Window: 1 variety / 1,650 yen
・*All prices include tax.
The pouch with a window features a chibi character on the front and a transparent window on the back.
Trading Goods
Four types of blind-box items are available. The purchase limit for each is up to the equivalent of 3 boxes.
・Trading Original Illustration Sparkly Pin Badges: 6 varieties total / 5,940 yen per box, 660 yen each
・Trading Acrylic Coasters: 9 varieties total / 7,920 yen per box, 880 yen each
・Trading Bookmark Charms: 9 varieties total / 5,940 yen per box, 660 yen each
・Trading Chibi Character Acrylic Stands: 5 varieties total / 4,400 yen per box, 880 yen each
・*All prices include tax
・*Since these are blind-box items, you cannot choose the design
The bonus for merchandise purchases is a character card
For every 3,000 yen (tax included) spent per transaction, you will receive one random character card.
・Bonus: Character Card (9 varieties total)
・Eligibility: For every 3,000 yen (tax included) spent per transaction
・*Receipts cannot be combined (including with receipts for food and beverage purchases)
・*Designs cannot be selected, and you may receive duplicate designs
・*Offer ends when supplies run out
© Yoshimizu/Ichijinsha
How to Use and Important Notes
Reservations are not accepted; customers must visit the store in person.
・Reservations: None (In-store visit only)
・Business Hours: 9:00 AM – 9:30 PM
・Last Order for Collaboration Food: 8:30 PM
・*If you do not follow staff instructions, you may be refused service.
・*The information provided in advance is subject to change depending on the situation on the day.
・*Exchanges and returns are not accepted except for defective items
The online store (ONLINE SHOP ffut) is currently under development, and the launch date and URL have not yet been announced.
・Click here for the special website (ffut)
The “Sis Mede” Collaboration Café Opens August 25!
© Yoshimizu/Ichijinsha
| Official Website | ffut Special Site |
|---|---|
| Event Dates & Venue | [August 25, 2026 – September 13, 2026] Patio de METRO Etica Ikebukuro (3-28-14 Nishi-Ikebukuro, Toshima-ku, Tokyo; directly connected to the B1 level of Tokyo Metropolitan Theatre / Ikebukuro Station Exit 2b) |
| Hours | 9:00 AM – 9:30 PM *Last order for collaboration food items is at 8:30 PM |
| Reservations | Not accepted (walk-in only) |
| Collaboration Menu | 4 food and dessert items (1,300–1,600 yen)/5 drink items (950 yen each) *All prices include tax |
| Special Offers | One coaster per order of a collaboration food or drink item (11 varieties in the first half / 8 varieties in the second half) For merchandise purchases, receive one character card (9 varieties total) for every 3,000 yen (tax included) spent per transaction |
Frequently Asked Questions About the “Sis Medo Collaboration Café”
Please tell me the event dates and venue.
It will be held from August 25 to September 13, 2026, at Patio de METRO Etica Ikebukuro.
The venue is directly connected to the B1 level of the Tokyo Metropolitan Theatre at 3-28-14 Nishi-Ikebukuro, Toshima-ku, Tokyo, and is accessible from Exit 2b of Ikebukuro Station.
Is a reservation required?
There is no reservation system.
The event operates on a walk-in basis. Business hours are 9:00 AM to 9:30 PM, and the last order for collaboration menu items is at 8:30 PM.
Do the coaster designs change during the event period?
Yes, they do.
There will be 11 different designs during the first half (August 25–September 3) and 8 different designs during the second half (September 4–September 13), with the designs rotating. In both periods, you cannot choose the design; coasters are distributed at random.
Will I receive a bonus coaster if I purchase merchandise?
No, you will not.
Coasters are a bonus for ordering collaboration food or drinks; they are not included with merchandise purchases. Conversely, ordering food or drinks does not include the character cards that come with merchandise purchases.
Can I purchase items online?
A post-event online sale (ONLINE SHOP ffut) is planned, but as of this writing, the launch date and URL are still being finalized.
Please note that some items may not be available for online purchase, and no purchase bonuses will be included.
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© Yoshimizu/Ichijinsha
