"You Can't Be in a Rom-Com with Your Childhood Friends!" Episode 4 Preview: Runako's Cohabitation Confession Triggers Chaos

The winter 2026 anime "You Can't Be in a Rom-Com with Your Childhood Friends!" is about to reach a major turning point! The official release has unveiled advance scene stills and a plot summary for Episode 4, where the third childhood friend officially makes her entrance.

This romantic comedy anime produced by Tezuka Productions depicts the agonizing "more than friends, less than lovers" relationship between the male lead and his multiple childhood friends. After Episode 4, titled "Even a Little Sister Character Can't Be in a Rom-Com Because It's 'Onii-chan', Even as an Adult," airs, the existing triangular balance will be completely shattered.

Episode 4 Plot Summary: Runa Suddenly Appears and Moves In

According to the latest official information, Episode 4's story revolves around a sudden development for the male lead, Eiyuu.

A beautiful girl suddenly appears, gazes at Eiyuu, and says: "I knew it~ It's Eiyuu-oniichan~~!"

This girl is none other than Tsukimi Runa — Eiyuu's neighbor from five years ago and a childhood friend one year his junior. Runa has returned to town to prepare for her high school entrance exams and will be "staying temporarily" at Eiyuu's house, beginning their cohabitation.

The Little Sister-Type Childhood Friend's Bold Confession

The newly arrived Runa plays by her own rules entirely. As a "little sister-type" character, she shows no sense of distance and instead launches a fierce offensive.

In the Episode 4 preview, Runa makes a bold declaration: "I think I've fallen head over heels for Eiyuu-oniichan!" She even states plainly: "I want to do naughty things with you, I like you".

Faced with this direct confession from his former little neighbor, Eiyuu not only finds his heart shaken but must also deal with the impending love battlefield. With the third childhood friend officially joining the fray, the relationship map is about to become even more tangled.

Episode 4 Viewer Highlights Analysis

• The Lethality of the Little Sister Attribute: Runa uses the "oniichan" address to close the distance while constantly testing romantic boundaries. This contrast is the episode's biggest highlight.
• The Chemical Reaction of the Cohabitation Setup: Unlike Shio Minamo and Akari Hiodoshi who live nearby, Runa moves in directly, creating a sense of crisis for the other heroines.
• Eiyuu's Rationality Crumbles: Faced with such straightforward temptation, can Eiyuu, who tries to maintain a pure relationship, hold the line?

Episode 4 of "You Can't Be in a Rom-Com with Your Childhood Friends!" will air on January 26th. Fans of love polygon comedies and love battlefields absolutely must not miss it!