| Seno Mary
Tummy Tummy Ache
|Kanji Name||瀬乃 愛|
|Katakana Name||ｾﾉ ﾒｱﾘｰ|
|Romaji Name||Seno Meari|
|Date of Birth||September 8th|
|Dislikes||Lack of sleep|
|Voice Actor||青柳るう(Ru Aoyagi)|
Mary is a possible friend in 1bitheart. She is introduced in Chapter 4. She is an idol.
- Her stage name "Tummy Tummy Ache" is a allusion to the real life singer Kyary Pamyu Pamyu.
- “Be wary on the streets, be Mary if you’re me. My other name’s Tummy Tummy Ache. My tummy aches. I’m Mary.”-Mary, when being introduced.
- "Such things do not matter to me." -Mary when told by Nanashi that her dress would get stained at the beach.
- "Now I and Nanashi are friends, I see. Let's get along well. I'm Mary." - Mary when befriended.